From 7ee9ebc1510180155de6572e0f8291bb7f9e698d Mon Sep 17 00:00:00 2001
From: Vyacheslav Rybalchenko <v.rybalchenko@innopolis.university>
Date: Sun, 21 Apr 2024 16:23:58 +0300
Subject: [PATCH] fix(objectionary#3035): fix ./eo-parser yaml linting errors
 and warnings

---
 .../resources/org/eolang/parser/packs/add-locators.yaml    | 3 ++-
 .../test/resources/org/eolang/parser/packs/add-probes.yaml | 1 +
 .../org/eolang/parser/packs/add-versioned-probes.yaml      | 1 +
 .../org/eolang/parser/packs/adds-default-package.yaml      | 1 +
 .../test/resources/org/eolang/parser/packs/adds-refs.yaml  | 1 +
 .../resources/org/eolang/parser/packs/all-data-types.yaml  | 3 ++-
 .../resources/org/eolang/parser/packs/broken-refs.yaml     | 3 ++-
 .../parser/packs/catches/catches-abstract-decoratee.yaml   | 1 +
 .../parser/packs/catches/catches-alias-duplicates.yaml     | 1 +
 .../parser/packs/catches/catches-atoms-without-rt.yaml     | 1 +
 .../parser/packs/catches/catches-broken-aliases.yaml       | 1 +
 .../catches/catches-comment-format-without-tests.yaml      | 3 ++-
 .../parser/packs/catches/catches-duplicate-metas.yaml      | 1 +
 .../parser/packs/catches/catches-duplicate-names.yaml      | 1 +
 .../parser/packs/catches/catches-empty-package-meta.yaml   | 1 +
 .../packs/catches/catches-external-weak-typed-atoms.yaml   | 1 +
 .../parser/packs/catches/catches-global-nonames.yaml       | 3 ++-
 .../parser/packs/catches/catches-incorrect-architect.yaml  | 1 +
 .../parser/packs/catches/catches-incorrect-home.yaml       | 3 ++-
 .../parser/packs/catches/catches-incorrect-version.yaml    | 1 +
 .../parser/packs/catches/catches-mandatory-home-meta.yaml  | 1 +
 .../packs/catches/catches-mandatory-package-meta.yaml      | 1 +
 .../packs/catches/catches-mandatory-version-meta.yaml      | 1 +
 .../parser/packs/catches/catches-many-free-attrs.yaml      | 1 +
 .../parser/packs/catches/catches-metas-unsorted.yaml       | 1 +
 .../parser/packs/catches/catches-name-duplicates.yaml      | 1 +
 .../eolang/parser/packs/catches/catches-noname-attrs.yaml  | 1 +
 .../parser/packs/catches/catches-not-one-home-meta.yaml    | 1 +
 .../parser/packs/catches/catches-not-one-package-meta.yaml | 1 +
 .../parser/packs/catches/catches-not-one-version-meta.yaml | 1 +
 .../parser/packs/catches/catches-only-name-duplicates.yaml | 3 ++-
 .../parser/packs/catches/catches-prohibited-package.yaml   | 3 ++-
 .../parser/packs/catches/catches-rt-without-atoms.yaml     | 1 +
 .../catches/catches-self-naming-with-method-and-this.yaml  | 1 +
 .../packs/catches/catches-self-naming-with-method.yaml     | 1 +
 .../packs/catches/catches-self-naming-with-this.yaml       | 1 +
 .../eolang/parser/packs/catches/catches-self-naming.yaml   | 1 +
 .../parser/packs/catches/catches-signed-binding-index.yaml | 1 +
 .../parser/packs/catches/catches-sparse-decoration.yaml    | 3 ++-
 .../packs/catches/catches-unit-test-without-phi.yaml       | 1 +
 .../eolang/parser/packs/catches/catches-unknown-names.yaml | 1 +
 .../parser/packs/catches/catches-unused-aliases.yaml       | 1 +
 .../org/eolang/parser/packs/const-to-dataized.yaml         | 1 +
 .../org/eolang/parser/packs/cti/cti-adds-error.yaml        | 3 ++-
 .../org/eolang/parser/packs/cti/cti-adds-warning.yaml      | 3 ++-
 .../resources/org/eolang/parser/packs/empty-vs-free.yaml   | 3 ++-
 .../test/resources/org/eolang/parser/packs/expand-qqs.yaml | 3 ++-
 .../resources/org/eolang/parser/packs/expands-aliases.yaml | 3 ++-
 .../resources/org/eolang/parser/packs/explicit-data.yaml   | 1 +
 .../org/eolang/parser/packs/float-up-same-attrs.yaml       | 1 +
 .../eolang/parser/packs/float-vars-with-pre-methods.yaml   | 1 +
 .../test/resources/org/eolang/parser/packs/float-vars.yaml | 3 ++-
 .../resources/org/eolang/parser/packs/full-syntax.yaml     | 5 +++--
 .../resources/org/eolang/parser/packs/has-comment.yaml     | 3 ++-
 .../test/resources/org/eolang/parser/packs/leap-year.yaml  | 1 +
 .../resources/org/eolang/parser/packs/line-numbers.yaml    | 3 ++-
 .../resources/org/eolang/parser/packs/onlyphi-bound.yaml   | 3 ++-
 .../parser/packs/optimize/fix-names-with-duplicates.yaml   | 3 ++-
 .../org/eolang/parser/packs/optimize/fixes-globals.yaml    | 1 +
 .../org/eolang/parser/packs/optimize/float-abstracts.yaml  | 1 +
 .../eolang/parser/packs/optimize/float-and-keep-names.yaml | 1 +
 .../parser/packs/optimize/float-nested-anonymous.yaml      | 3 ++-
 .../parser/packs/optimize/floating-sets-parent-names.yaml  | 1 +
 .../org/eolang/parser/packs/optimize/multi-anonymous.yaml  | 1 +
 .../eolang/parser/packs/optimize/not-redundant-levels.yaml | 1 +
 ...dundant-levels-with-arguments-and-abstract-parents.yaml | 3 ++-
 .../redundant-levels-with-arguments-and-siblings.yaml      | 3 ++-
 .../packs/optimize/redundant-levels-with-arrays.yaml       | 3 ++-
 .../packs/optimize/redundant-levels-with-siblings.yaml     | 3 ++-
 .../org/eolang/parser/packs/optimize/redundant-levels.yaml | 3 ++-
 .../resources/org/eolang/parser/packs/parsed-data.yaml     | 1 +
 .../org/eolang/parser/packs/preserves-spaces.yaml          | 1 +
 .../eolang/parser/packs/priority/additional-brackets.yaml  | 3 ++-
 .../org/eolang/parser/packs/priority/space-between.yaml    | 1 +
 .../test/resources/org/eolang/parser/packs/recursion.yaml  | 3 ++-
 .../org/eolang/parser/packs/resolves-aliases.yaml          | 1 +
 .../org/eolang/parser/packs/scope-before-method.yaml       | 5 +++--
 .../org/eolang/parser/packs/scopes-double-scope.yaml       | 3 ++-
 .../resources/org/eolang/parser/packs/scopes-nested.yaml   | 5 +++--
 .../eolang/parser/packs/scopes-with-doubled-methods.yaml   | 3 ++-
 .../eolang/parser/packs/scopes-with-nested-methods.yaml    | 1 +
 .../src/test/resources/org/eolang/parser/packs/scopes.yaml | 5 +++--
 .../org/eolang/parser/packs/self-naming-no-catch.yaml      | 1 +
 .../src/test/resources/org/eolang/parser/packs/simple.yaml | 5 +++--
 .../org/eolang/parser/packs/syntax/anonymous-more.yaml     | 1 +
 .../org/eolang/parser/packs/syntax/anonymous.yaml          | 3 ++-
 .../eolang/parser/packs/syntax/bool-tests-straight.yaml    | 5 +++--
 .../parser/packs/syntax/bound-reversed-application.yaml    | 5 +++--
 .../org/eolang/parser/packs/syntax/escape-sequences.yaml   | 4 ++--
 .../resources/org/eolang/parser/packs/syntax/numbers.yaml  | 3 ++-
 .../org/eolang/parser/packs/syntax/post-method.yaml        | 3 ++-
 .../org/eolang/parser/packs/syntax/pre-method.yaml         | 3 ++-
 .../eolang/parser/packs/syntax/redundant-parentheses.yaml  | 3 ++-
 .../org/eolang/parser/packs/syntax/text-block.yaml         | 3 ++-
 .../resources/org/eolang/parser/packs/syntax/tuples.yaml   | 1 +
 .../resources/org/eolang/parser/packs/syntax/versions.yaml | 3 ++-
 .../packs/syntax/vertical-methods-in-application.yaml      | 3 ++-
 .../parser/packs/syntax/vmethod-after-formation.yaml       | 5 +++--
 .../test/resources/org/eolang/parser/packs/unicode.yaml    | 3 ++-
 .../resources/org/eolang/parser/packs/wraps-methods.yaml   | 1 +
 .../test/resources/org/eolang/parser/samples/bytes.yaml    | 1 +
 .../test/resources/org/eolang/parser/samples/dataless.yaml | 1 +
 .../resources/org/eolang/parser/samples/empty-bytes.yaml   | 1 +
 .../resources/org/eolang/parser/samples/empty-string.yaml  | 1 +
 .../resources/org/eolang/parser/samples/idiomatic.yaml     | 1 +
 .../resources/org/eolang/parser/samples/inheritance.yaml   | 1 +
 .../org/eolang/parser/samples/inner-formation.yaml         | 1 +
 .../resources/org/eolang/parser/samples/just-float.yaml    | 1 +
 .../org/eolang/parser/samples/multiline-string.yaml        | 1 +
 .../org/eolang/parser/samples/same-name-inners.yaml        | 1 +
 .../resources/org/eolang/parser/samples/stars-tuples.yaml  | 1 +
 .../test/resources/org/eolang/parser/samples/times.yaml    | 1 +
 .../org/eolang/parser/typos/binding-with-rho.yaml          | 1 +
 .../resources/org/eolang/parser/typos/broken-head.yaml     | 1 +
 .../org/eolang/parser/typos/comment-in-method.yaml         | 1 +
 .../org/eolang/parser/typos/double-empty-lines.yaml        | 5 +++--
 .../eolang/parser/typos/double-root-inside-locator.yaml    | 1 +
 .../eolang/parser/typos/empty-line-before-application.yaml | 1 +
 .../parser/typos/empty-line-before-first-object.yaml       | 1 +
 .../eolang/parser/typos/empty-line-before-method-2.yaml    | 7 ++++---
 .../org/eolang/parser/typos/empty-line-before-method.yaml  | 1 +
 .../eolang/parser/typos/empty-line-before-ref-deep.yaml    | 1 +
 .../org/eolang/parser/typos/empty-line-before-ref.yaml     | 1 +
 .../org/eolang/parser/typos/empty-line-between-metas.yaml  | 5 +++--
 .../parser/typos/empty-line-in-vertical-application.yaml   | 1 +
 .../resources/org/eolang/parser/typos/empty-object.yaml    | 1 +
 .../org/eolang/parser/typos/hmethod-after-vmethod.yaml     | 3 ++-
 .../org/eolang/parser/typos/invalid-int-literal.yaml       | 1 +
 .../resources/org/eolang/parser/typos/long-character.yaml  | 1 +
 .../parser/typos/missing-empty-line-after-metas.yaml       | 1 +
 .../resources/org/eolang/parser/typos/not-empty-atoms.yaml | 1 +
 .../org/eolang/parser/typos/one-space-indent.yaml          | 1 +
 .../parser/typos/redundant-parentheses/extra-braces-1.yaml | 3 ++-
 .../parser/typos/redundant-parentheses/extra-braces-2.yaml | 3 ++-
 .../parser/typos/redundant-parentheses/extra-braces-3.yaml | 3 ++-
 .../parser/typos/redundant-parentheses/extra-braces-4.yaml | 3 ++-
 .../parser/typos/redundant-parentheses/extra-braces-5.yaml | 3 ++-
 .../parser/typos/redundant-parentheses/extra-braces-6.yaml | 3 ++-
 .../parser/typos/redundant-parentheses/just-number.yaml    | 3 ++-
 .../typos/redundant-parentheses/negative-numbers.yaml      | 3 ++-
 .../eolang/parser/typos/redundant-parentheses/numbers.yaml | 1 +
 .../redundant-parentheses/simple-application-named.yaml    | 1 +
 .../typos/redundant-parentheses/simple-application.yaml    | 1 +
 .../org/eolang/parser/typos/redundent-parenheses.yaml      | 1 +
 .../eolang/parser/typos/reversed-as-separate-argument.yaml | 1 +
 .../org/eolang/parser/typos/root-inside-locator.yaml       | 1 +
 .../parser/typos/scoped-application-after-suffix.yaml      | 3 ++-
 .../resources/org/eolang/parser/typos/space-in-naming.yaml | 1 +
 .../resources/org/eolang/parser/typos/space-in-tail.yaml   | 1 +
 .../org/eolang/parser/typos/suffix-with-dots.yaml          | 1 +
 .../org/eolang/parser/typos/too-far-right-indent.yaml      | 1 +
 .../org/eolang/parser/typos/trailing-space-in-comment.yaml | 2 ++
 .../resources/org/eolang/parser/typos/varargs-inside.yaml  | 1 +
 .../parser/typos/version-with-inline-application.yaml      | 1 +
 .../typos/vertical-method-in-horizontal-application.yaml   | 3 ++-
 .../org/eolang/parser/typos/vertical-method-in-scope.yaml  | 3 ++-
 .../eolang/parser/typos/vmethod-after-happlication.yaml    | 3 ++-
 .../org/eolang/parser/typos/vmethod-after-hmethod.yaml     | 3 ++-
 .../org/eolang/parser/typos/xi-inside-locator.yaml         | 1 +
 .../resources/org/eolang/parser/xax/add-locs-with-dot.yml  | 1 +
 .../src/test/resources/org/eolang/parser/xax/add-locs.yml  | 1 +
 .../src/test/resources/org/eolang/parser/xax/add-refs.yml  | 1 +
 .../org/eolang/parser/xax/zero-version-correct.yml         | 1 +
 .../eolang/parser/xax/zero-version-incorrect-for-main.yml  | 1 +
 .../eolang/parser/xax/zero-version-incorrect-for-test.yml  | 1 +
 .../org/eolang/parser/xax/zero-version-no-version.yml      | 1 +
 .../parser/xax/zero-version-not-applicable-source.yml      | 1 +
 167 files changed, 244 insertions(+), 77 deletions(-)

diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/add-locators.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/add-locators.yaml
index fde8d21a66..ff859aa42d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/add-locators.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/add-locators.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(error)=0]
   - //o[@name='a' and @loc='Φ.org.abc.a']
@@ -36,5 +37,5 @@ eo: |
       6.2
     [e]
       e.hello > @
-  
+
   $.&.^.p > q
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/add-probes.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/add-probes.yaml
index ecb7f0a607..a4957388e2 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/add-probes.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/add-probes.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(error)=0]
   - /program/sheets/sheet[contains(text(),'add-probes')]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/add-versioned-probes.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/add-versioned-probes.yaml
index c581535ddc..9c270dbffd 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/add-versioned-probes.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/add-versioned-probes.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
   - /org/eolang/parser/expand-qqs.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/adds-default-package.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/adds-default-package.yaml
index f49ae8328b..5dbceacc7d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/adds-default-package.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/adds-default-package.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/add-refs.xsl
   - /org/eolang/parser/expand-aliases.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/adds-refs.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/adds-refs.yaml
index 903479fb86..d7ae30fded 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/adds-refs.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/adds-refs.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/critical-errors/duplicate-names.xsl
   - /org/eolang/parser/errors/self-naming.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/all-data-types.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/all-data-types.yaml
index 7610aa93aa..0eb089c016 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/all-data-types.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/all-data-types.yaml
@@ -1,3 +1,4 @@
+---
 xsls: [ ]
 tests:
   - /program/errors[count(*)=0]
@@ -19,7 +20,7 @@ tests:
   - //o[@base='string' and @name='textX' and @data]
 eo: |
   +package test
-  
+
   01- > bytesX
 
   00-02-4F-1A-FF-01 > bytesX
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/broken-refs.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/broken-refs.yaml
index 80d8a90f10..9d36784672 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/broken-refs.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/broken-refs.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/add-refs.xsl
   - /org/eolang/parser/errors/broken-refs.xsl
@@ -9,4 +10,4 @@ eo: |
   # This is the default 64+ symbols comment in front of abstract object.
   [] > app
     42 > a
-    a.plus 1 > @
\ No newline at end of file
+    a.plus 1 > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-abstract-decoratee.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-abstract-decoratee.yaml
index 6ae4a83209..8eb127fc10 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-abstract-decoratee.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-abstract-decoratee.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/abstract-decoratee.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-alias-duplicates.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-alias-duplicates.yaml
index ca44664bde..286877b2dc 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-alias-duplicates.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-alias-duplicates.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/duplicate-aliases.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-atoms-without-rt.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-atoms-without-rt.yaml
index 090505622f..ad7fa5945f 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-atoms-without-rt.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-atoms-without-rt.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/rt-and-atoms.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-broken-aliases.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-broken-aliases.yaml
index b03aadd66d..de017cefb4 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-broken-aliases.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-broken-aliases.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/broken-aliases.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-comment-format-without-tests.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-comment-format-without-tests.yaml
index a9f1e95aa4..b131f3519a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-comment-format-without-tests.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-comment-format-without-tests.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(error)=0]
 eo: |
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-metas.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-metas.yaml
index 09b32e006e..0bd0ef57dd 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-metas.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-metas.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/duplicate-metas.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-names.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-names.yaml
index 95963ce03a..e555e899ad 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-names.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-duplicate-names.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/critical-errors/duplicate-names.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-empty-package-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-empty-package-meta.yaml
index 10cece60c3..c9a77131c3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-empty-package-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-empty-package-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/correct-package-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-external-weak-typed-atoms.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-external-weak-typed-atoms.yaml
index 3c3660851c..efc18d7180 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-external-weak-typed-atoms.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-external-weak-typed-atoms.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/external-weak-typed-atoms.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-global-nonames.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-global-nonames.yaml
index 3398c2f59d..5933103216 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-global-nonames.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-global-nonames.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/global-nonames.xsl
 tests:
@@ -7,5 +8,5 @@ eo: |
   3.14 > pi
 
   fake
-  
+
   a.b > good
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-architect.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-architect.yaml
index 6c2e1866ac..e7a02d19c3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-architect.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-architect.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/incorrect-architect.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-home.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-home.yaml
index 398889846a..03f7036d6c 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-home.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-home.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/incorrect-home.xsl
 tests:
@@ -12,7 +13,7 @@ eo: |
   +home www.something.com
   +alias org.eolang.io.stdout
   +home https://|http/wrong.com
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [x] > foo
     x.div in.nextInt > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-version.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-version.yaml
index 0f244840cc..51d96fc22e 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-version.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-incorrect-version.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/incorrect-version.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-home-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-home-meta.yaml
index 866ab113c4..5856006057 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-home-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-home-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/mandatory-home-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-package-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-package-meta.yaml
index cea077acdc..c882de669b 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-package-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-package-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/mandatory-package-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-version-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-version-meta.yaml
index 2c4f8aaeb5..b790bcd1ad 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-version-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-mandatory-version-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/mandatory-version-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-many-free-attrs.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-many-free-attrs.yaml
index ab23d80e8a..d741435364 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-many-free-attrs.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-many-free-attrs.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/many-free-attributes.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-metas-unsorted.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-metas-unsorted.yaml
index 7706cb3185..8422971cb7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-metas-unsorted.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-metas-unsorted.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/unsorted-metas.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-name-duplicates.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-name-duplicates.yaml
index 3d65a6e499..11ac4af963 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-name-duplicates.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-name-duplicates.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/critical-errors/duplicate-names.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-noname-attrs.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-noname-attrs.yaml
index 64184d579f..28a1305101 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-noname-attrs.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-noname-attrs.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
   - /org/eolang/parser/errors/noname-attributes.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-home-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-home-meta.yaml
index bedc5f4349..25a5a6f011 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-home-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-home-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/mandatory-home-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-package-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-package-meta.yaml
index d235a9ec64..24b3e23bf3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-package-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-package-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/mandatory-package-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-version-meta.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-version-meta.yaml
index 735a497e02..4fb37c4516 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-version-meta.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-not-one-version-meta.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/mandatory-version-meta.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-only-name-duplicates.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-only-name-duplicates.yaml
index 0ede7ab149..4178f5608f 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-only-name-duplicates.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-only-name-duplicates.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/critical-errors/duplicate-names.xsl
   - /org/eolang/parser/errors/duplicate-aliases.xsl
@@ -17,4 +18,4 @@ eo: |
   [x] > foo
     stdout > @
       sprintf
-        "Hello"
\ No newline at end of file
+        "Hello"
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-prohibited-package.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-prohibited-package.yaml
index 75c820b893..57ae13aa54 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-prohibited-package.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-prohibited-package.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/prohibited-package.xsl
 tests:
@@ -7,4 +8,4 @@ eo: |
   +package org.eolang
 
   # This is the default 64+ symbols comment in front of abstract object.
-  [] > main
\ No newline at end of file
+  [] > main
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-rt-without-atoms.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-rt-without-atoms.yaml
index 4cc5cd8735..94b500cbf4 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-rt-without-atoms.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-rt-without-atoms.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/rt-and-atoms.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method-and-this.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method-and-this.yaml
index 64a1f326cc..6758cd7880 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method-and-this.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method-and-this.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/self-naming.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method.yaml
index f1ac3d107b..c045773b13 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-method.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/self-naming.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-this.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-this.yaml
index 211e030598..ff09d133d2 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-this.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming-with-this.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/self-naming.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming.yaml
index d3550f901c..79deae959e 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-self-naming.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/self-naming.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-signed-binding-index.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-signed-binding-index.yaml
index 7f887841bb..7968d7de2a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-signed-binding-index.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-signed-binding-index.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/signed-binding-indexes.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-sparse-decoration.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-sparse-decoration.yaml
index 0ea65d8fc6..4d9c8928a9 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-sparse-decoration.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-sparse-decoration.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/sparse-decoration.xsl
 tests:
@@ -24,7 +25,7 @@ eo: |
       true
       5
       five
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [free] > decorates-with-free-args
     five > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unit-test-without-phi.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unit-test-without-phi.yaml
index d1358504ed..8d44a41bdc 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unit-test-without-phi.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unit-test-without-phi.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/warnings/unit-test-without-phi.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unknown-names.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unknown-names.yaml
index 8df110d707..cfc504d7b3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unknown-names.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unknown-names.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/unknown-names.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unused-aliases.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unused-aliases.yaml
index 07c322d8d7..bb33a0faf6 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unused-aliases.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/catches/catches-unused-aliases.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/expand-aliases.xsl
   - /org/eolang/parser/resolve-aliases.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/const-to-dataized.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/const-to-dataized.yaml
index 053e50da8c..365cf72754 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/const-to-dataized.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/const-to-dataized.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - //o[@base='.as-bytes' and @line and @pos and @name='x' and o[@base='org.eolang.dataized' and o[@base='org.eolang.int' and not(@name)]]]
   - //o[@base='.as-bytes' and @line and @pos and @name='m' and o[@base='org.eolang.dataized' and o[@abstract and @name='m-3' and count(o)=2]]]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-error.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-error.yaml
index 20eb43b0cc..6e50586975 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-error.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-error.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/cti/cti-adds-errors.xsl
 tests:
@@ -19,4 +20,4 @@ eo: |
     QQ.io.stdout > @
       QQ.txt.sprintf
         "The result is %d\n"
-        foo
\ No newline at end of file
+        foo
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-warning.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-warning.yaml
index a5d24bae54..3a0820c4c6 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-warning.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/cti/cti-adds-warning.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/cti/cti-adds-errors.xsl
 tests:
@@ -19,4 +20,4 @@ eo: |
     QQ.io.stdout > @
       QQ.txt.sprintf
         "The result is %d\n"
-        foo
\ No newline at end of file
+        foo
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/empty-vs-free.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/empty-vs-free.yaml
index 23549572c7..2681a8b17b 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/empty-vs-free.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/empty-vs-free.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(*)=0]
   - //o[@name='foo' and count(o)=2]
@@ -7,7 +8,7 @@ eo: |
   +home https://github.com/objectionary/eo
   +package test
   +version 0.0.0
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [x] > foo
     # This is the default 64+ symbols comment in front of abstract object.
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/expand-qqs.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/expand-qqs.yaml
index 9be3f32d2d..890de21a3f 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/expand-qqs.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/expand-qqs.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/expand-qqs.xsl
 tests:
@@ -10,7 +11,7 @@ tests:
   - //metas[count(.//meta[head/text()='alias']/*[text()[starts-with(., 'Q.org.eolang.txt.sprintfQQ')]])=2]
 eo: |
   +alias QQ.txt.sprintfQQ
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [] > app
     QQ.io.stdout > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/expands-aliases.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/expands-aliases.yaml
index c2a64af50c..c254ebeb66 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/expands-aliases.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/expands-aliases.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/expand-aliases.xsl
 tests:
@@ -7,7 +8,7 @@ tests:
 eo: |
   +alias org.eolang.txt.scanner
   +alias stdin org.eolang.io.stdin
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [args] > main
     and
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/explicit-data.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/explicit-data.yaml
index afe2b3af76..838e264fb3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/explicit-data.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/explicit-data.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
   - /org/eolang/parser/expand-qqs.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/float-up-same-attrs.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/float-up-same-attrs.yaml
index 656c69a852..dbb512d052 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/float-up-same-attrs.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/float-up-same-attrs.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/remove-refs.xsl
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars-with-pre-methods.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars-with-pre-methods.yaml
index 7f6323d79b..5bdd745f4f 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars-with-pre-methods.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars-with-pre-methods.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/vars-float-up.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars.yaml
index c49f919600..894df5394f 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/float-vars.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/add-refs.xsl
   - /org/eolang/parser/vars-float-up.xsl
@@ -33,7 +34,7 @@ eo: |
     # This is the default 64+ symbols comment in front of abstract object.
     [] > last
       three 1
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [ppp] > pp
     one
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/full-syntax.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/full-syntax.yaml
index cb5eb56fa2..eecdacbd76 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/full-syntax.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/full-syntax.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(error)=0]
   - /program/license[text()!='']
@@ -79,7 +80,7 @@ eo: |
       @.
         b
     oops
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [] > obj
     "some" > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/has-comment.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/has-comment.yaml
index 5640fdfd89..ab5f1955ee 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/has-comment.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/has-comment.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/comment()[1]
 eo: |
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/leap-year.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/leap-year.yaml
index bdf1c62053..ef90e7cc5d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/leap-year.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/leap-year.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(*)=0]
   - /program/objects[count(o)=1]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/line-numbers.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/line-numbers.yaml
index 5d023c4be1..0a43632fa1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/line-numbers.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/line-numbers.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='foo' and @line='1' and @pos='0']
   - //o[@base='bar' and @line='2' and @pos='2']
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/onlyphi-bound.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/onlyphi-bound.yaml
index f9aeb7ad58..0ac99a5c82 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/onlyphi-bound.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/onlyphi-bound.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='a']/o[@abstract and not(@name) and o[@name='@' and @base='.b'] and o[not(@base) and @name='i']]
   - //o[@base='a']/o[@abstract and not(@name) and o[@name='@' and @base='a' and o[@base='b']]]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fix-names-with-duplicates.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fix-names-with-duplicates.yaml
index 6efd6d8fe4..2722547a26 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fix-names-with-duplicates.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fix-names-with-duplicates.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/remove-refs.xsl
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
@@ -15,7 +16,7 @@ eo: |
       plus. > @
         f.next
         s.next
-  
+
     seq > @
       QQ.io.stdout
         QQ.txt.sprintf
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fixes-globals.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fixes-globals.yaml
index f52d10bade..1e38045d90 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fixes-globals.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/fixes-globals.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/globals-to-abstracts.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-abstracts.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-abstracts.yaml
index cc390c1ead..41b9fa27a0 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-abstracts.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-abstracts.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/remove-refs.xsl
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-and-keep-names.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-and-keep-names.yaml
index 160ccde99e..192f5b8705 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-and-keep-names.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-and-keep-names.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/remove-refs.xsl
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-nested-anonymous.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-nested-anonymous.yaml
index 01b304e5c6..91b1b4d884 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-nested-anonymous.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/float-nested-anonymous.yaml
@@ -1,3 +1,4 @@
+---
 defaults: true
 xsls:
   - /org/eolang/parser/add-refs.xsl
@@ -8,4 +9,4 @@ tests:
 eo: |
   foo > a
     [x]
-      x > @
\ No newline at end of file
+      x > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/floating-sets-parent-names.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/floating-sets-parent-names.yaml
index 545d40ae9b..168693da12 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/floating-sets-parent-names.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/floating-sets-parent-names.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/add-refs.xsl
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/multi-anonymous.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/multi-anonymous.yaml
index c26eeb47e9..e8b906e1b7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/multi-anonymous.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/multi-anonymous.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
   - /org/eolang/parser/critical-errors/duplicate-names.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/not-redundant-levels.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/not-redundant-levels.yaml
index 549c78e960..90c5b7d6e3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/not-redundant-levels.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/not-redundant-levels.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
   - /org/eolang/parser/optimize/remove-levels.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-abstract-parents.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-abstract-parents.yaml
index 5b84075879..f3df77213d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-abstract-parents.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-abstract-parents.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
   - /org/eolang/parser/optimize/remove-levels.xsl
@@ -56,4 +57,4 @@ eo: |
         arg.one > @
       # This is the default 64+ symbols comment in front of abstract object.
       [] > second
-        arg.two > @
\ No newline at end of file
+        arg.two > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-siblings.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-siblings.yaml
index 720790cd17..3897d28003 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-siblings.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arguments-and-siblings.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
   - /org/eolang/parser/optimize/remove-levels.xsl
@@ -45,4 +46,4 @@ eo: |
         arg.one > @
       # This is the default 64+ symbols comment in front of abstract object.
       [] > second
-        arg.two > @
\ No newline at end of file
+        arg.two > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arrays.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arrays.yaml
index 9a56155033..a722430df6 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arrays.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-arrays.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
@@ -44,4 +45,4 @@ eo: |
     * 0 (* 1 2) > arr
     eq > @
       * ((arr.at 1).at 1)
-      * 2
\ No newline at end of file
+      * 2
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-siblings.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-siblings.yaml
index aab7072c31..79b55f232d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-siblings.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels-with-siblings.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
   - /org/eolang/parser/optimize/remove-levels.xsl
@@ -39,4 +40,4 @@ eo: |
         1 > @
       # This is the default 64+ symbols comment in front of abstract object.
       [] > second
-        2 > @
\ No newline at end of file
+        2 > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels.yaml
index d442c2c097..f7c7ced0d1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/optimize/redundant-levels.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/optimize/abstracts-float-up.xsl
   - /org/eolang/parser/optimize/remove-levels.xsl
@@ -37,4 +38,4 @@ eo: |
         1 > @
       # This is the default 64+ symbols comment in front of abstract object.
       [] > second
-        2 > @
\ No newline at end of file
+        2 > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/parsed-data.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/parsed-data.yaml
index 6200d9cab9..3ca915bced 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/parsed-data.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/parsed-data.yaml
@@ -1,3 +1,4 @@
+---
 xsls: [ ]
 tests:
   - //o[@name='i1' and text()='00 00 00 00 00 00 00 2A']
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/preserves-spaces.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/preserves-spaces.yaml
index 0f29e0934a..ae594ba26e 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/preserves-spaces.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/preserves-spaces.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/not-empty-atoms.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/priority/additional-brackets.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/priority/additional-brackets.yaml
index b7b12d253c..b6c45cf8be 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/priority/additional-brackets.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/priority/additional-brackets.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(error)=0]
   - //o[@base='.plus']/o[@base='.value']/o[contains(@base,'other')]
@@ -8,4 +9,4 @@ eo: |
 
   # This is the default 64+ symbols comment in front of abstract object.
   [] > x
-    1.times 2 (1.plus other.value) > @
\ No newline at end of file
+    1.times 2 (1.plus other.value) > @
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/priority/space-between.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/priority/space-between.yaml
index fdd02ef28d..29a06c031c 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/priority/space-between.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/priority/space-between.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(error)=0]
   - //o[@base='.plus']/o[@base='.a']/o[@base='^']
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/recursion.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/recursion.yaml
index fb60452719..dba989c2ec 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/recursion.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/recursion.yaml
@@ -1,3 +1,4 @@
+---
 tests:
   - /program/errors[count(*)=0]
   - //o[@name='f' and @line='8']
@@ -6,7 +7,7 @@ eo: |
   +home https://github.com/objectionary/eo
   +package test
   +version 0.0.0
-  
+
   # This is the default 64+ symbols comment in front of abstract object.
   [args] > main
     # This is the default 64+ symbols comment in front of abstract object.
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/resolves-aliases.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/resolves-aliases.yaml
index 7e758cfd3e..30bfda6579 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/resolves-aliases.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/resolves-aliases.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/add-refs.xsl
   - /org/eolang/parser/expand-aliases.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/scope-before-method.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/scope-before-method.yaml
index 465df421e8..bdbbc8b239 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/scope-before-method.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/scope-before-method.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='foo' and count(o)=1]
 eo: |
@@ -11,4 +12,4 @@ eo: |
         42 > @
     eq. > @
       (foo 1).@ 2
-      42
\ No newline at end of file
+      42
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-double-scope.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-double-scope.yaml
index 43bbc39766..f8eed06abb 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-double-scope.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-double-scope.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='foo' and count(o)=2]
   - //o[@base='bar' and count(o)=2]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-nested.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-nested.yaml
index c58cd65eeb..3111f9d27b 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-nested.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-nested.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='foo' and count(o)=2]
   - //o[@base='bar' and count(o)=2]
@@ -17,4 +18,4 @@ eo: |
       44 > @
     eq. > @
       foobar (foo (bar 1 2) 3) 4
-      44
\ No newline at end of file
+      44
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-doubled-methods.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-doubled-methods.yaml
index ad9818bb1a..d44e8d94a7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-doubled-methods.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-doubled-methods.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
 tests:
@@ -7,4 +8,4 @@ eo: |
   # This is the default 64+ symbols comment in front of abstract object.
   [] > aliases
     eq. > @
-      (1.bar 2).foo (3.bar 4)
\ No newline at end of file
+      (1.bar 2).foo (3.bar 4)
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-nested-methods.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-nested-methods.yaml
index ce67f2195f..ec3876c72c 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-nested-methods.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes-with-nested-methods.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes.yaml
index ae2002cfd8..a22eee36ff 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/scopes.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/scopes.yaml
@@ -1,7 +1,8 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@abstract and count(o)=1]
 eo: |
   # This is the default 64+ symbols comment in front of abstract object.
   [] > aliases
-    a (b (c d))
\ No newline at end of file
+    a (b (c d))
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/self-naming-no-catch.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/self-naming-no-catch.yaml
index 65f1fa5f51..67d89939ce 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/self-naming-no-catch.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/self-naming-no-catch.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/errors/self-naming.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/simple.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/simple.yaml
index 7a0a877ae7..a6952839ff 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/simple.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/simple.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(*)=0]
   - /program[@name != '']
@@ -11,7 +12,7 @@ tests:
   - //o[@base='c4-5' and @line='5']
 eo: |
   +package test
-  
+
   a
     b-друг
       c4-5
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous-more.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous-more.yaml
index 09530fd878..b7b48eb7b8 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous-more.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous-more.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
 
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous.yaml
index a377d9c7e0..c79ee7f865 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/anonymous.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //objects[count(o)=5]
   - //o[@base='.plus' and @name='a']
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bool-tests-straight.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bool-tests-straight.yaml
index 2d8ccaf5b6..2c4a17619c 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bool-tests-straight.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bool-tests-straight.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //errors[count(error)=0]
 eo: |
@@ -1391,4 +1392,4 @@ eo: |
       .org
       .eolang
       .bytes:0
-        01-
\ No newline at end of file
+        01-
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bound-reversed-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bound-reversed-application.yaml
index 177fd2ca32..28d1047bc3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bound-reversed-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/bound-reversed-application.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(*)=0]
   - //o[@base='.if' and o[@base='string' and @as='0']]
@@ -10,4 +11,4 @@ eo: |
     true
     "TRUE":0
     "FALSE":1
-  if. false 1:a 2:b > second
\ No newline at end of file
+  if. false 1:a 2:b > second
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/escape-sequences.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/escape-sequences.yaml
index 951f2d16d8..f0767f5de0 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/escape-sequences.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/escape-sequences.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //objects[count(.//o[@base='string'])=7]
 eo: |
@@ -9,4 +10,3 @@ eo: |
   "\t"
   "\000"
   "\uFFFF"
-
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/numbers.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/numbers.yaml
index 69b515b657..e46fd69bdf 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/numbers.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/numbers.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //objects[count(o)=7]
 eo: |
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/post-method.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/post-method.yaml
index f0416ead96..635d13ceaa 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/post-method.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/post-method.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='one' and @name='test']
   - //o[@base='one' and count(o)=1]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/pre-method.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/pre-method.yaml
index 04b69be420..684a8338a4 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/pre-method.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/pre-method.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='.a' and @name='one' and count(o)=1]
   - //o[@base='.b' and @name='two' and count(o)=1]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/redundant-parentheses.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/redundant-parentheses.yaml
index 1621c09c45..987f05e8f1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/redundant-parentheses.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/redundant-parentheses.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(*)=0]
 eo: |
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/text-block.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/text-block.yaml
index 4bd3e51054..f369c6edd1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/text-block.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/text-block.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='string' and text()='48 69 2C 20 74 68 65 72 65 0A 41 64 69 C3 B3 73']
   - //o[@base='string' and text()='66 69 72 73 74 0A 20 73 65 63 6F 6E 64']
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/tuples.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/tuples.yaml
index 8cea9b0dac..d7da96a6b0 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/tuples.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/tuples.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/stars-to-tuples.xsl
   - /org/eolang/parser/stars-to-tuples.xsl
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/versions.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/versions.yaml
index c6395ed6f6..80f718e9b7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/versions.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/versions.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //o[@base='func0' and @ver='3.4.5' and @name='x']
   - //o[@base='func1' and @ver='1.2.3']
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vertical-methods-in-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vertical-methods-in-application.yaml
index eb88cde946..2f05c589fb 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vertical-methods-in-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vertical-methods-in-application.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(*)=0]
 eo: |
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vmethod-after-formation.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vmethod-after-formation.yaml
index 581896d064..74e92f1b70 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vmethod-after-formation.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/syntax/vmethod-after-formation.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - //errors[count(error)=0]
   - //o[@name='x' and @abstract]/following::o[@base='.first' and @method]
@@ -9,4 +10,4 @@ eo: |
     y > @
       []
       .second
-  .first
\ No newline at end of file
+  .first
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/unicode.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/unicode.yaml
index a16b273d06..49524a4c8a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/unicode.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/unicode.yaml
@@ -1,4 +1,5 @@
-xsls: []
+---
+xsls: [ ]
 tests:
   - /program/errors[count(*)=0]
   - /program/objects[count(o)=1]
diff --git a/eo-parser/src/test/resources/org/eolang/parser/packs/wraps-methods.yaml b/eo-parser/src/test/resources/org/eolang/parser/packs/wraps-methods.yaml
index 941fe367a5..3b479a95df 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/packs/wraps-methods.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/packs/wraps-methods.yaml
@@ -1,3 +1,4 @@
+---
 xsls:
   - /org/eolang/parser/wrap-method-calls.xsl
 tests:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/bytes.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/bytes.yaml
index 7b7830caf3..a6efb9658a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/bytes.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/bytes.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   EA-EA-EA-EA > xs
 
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/dataless.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/dataless.yaml
index 9c167eb11a..5ae39886d2 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/dataless.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/dataless.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   +package sandbox
 
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/empty-bytes.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/empty-bytes.yaml
index 2a6decade7..45ebf17c83 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/empty-bytes.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/empty-bytes.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   -- > empty
 
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/empty-string.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/empty-string.yaml
index 03e2fba92f..483a456a9a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/empty-string.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/empty-string.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   # This is the default 64+ symbols comment in front of named abstract object.
   [] > app
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/idiomatic.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/idiomatic.yaml
index 8395096196..d9b1d80d40 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/idiomatic.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/idiomatic.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   # This is the license part
   # of the program
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/inheritance.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/inheritance.yaml
index e5102a8be6..1219b9065a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/inheritance.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/inheritance.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   +package sandbox
   +alias stdout org.eolang.io.stdout
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/inner-formation.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/inner-formation.yaml
index 2760b5b674..a5e750644b 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/inner-formation.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/inner-formation.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   # This is the default 64+ symbols comment in front of named abstract object.
   [] > foo
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/just-float.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/just-float.yaml
index f6171ca491..be30e8b5a4 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/just-float.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/just-float.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   3.14 > pi
   # This is the default 64+ symbols comment in front of named abstract object.
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/multiline-string.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/multiline-string.yaml
index 3018c95b9c..6bb41d5280 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/multiline-string.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/multiline-string.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   # This is the default 64+ symbols comment in front of named abstract object.
   [] > app
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/same-name-inners.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/same-name-inners.yaml
index 5326a0c559..25c0fbec69 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/same-name-inners.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/same-name-inners.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   # This is the default 64+ symbols comment in front of named abstract object.
   [] > compiles-correctly-with-long-duplicate-names
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/stars-tuples.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/stars-tuples.yaml
index 02c9616a74..bd32637c8d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/stars-tuples.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/stars-tuples.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   * 1 "Hello" x > array
 
diff --git a/eo-parser/src/test/resources/org/eolang/parser/samples/times.yaml b/eo-parser/src/test/resources/org/eolang/parser/samples/times.yaml
index 330a6dbbd0..ea0f54060e 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/samples/times.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/samples/times.yaml
@@ -1,3 +1,4 @@
+---
 origin: |
   # This is the default 64+ symbols comment in front of named abstract object.
   [] > app
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/binding-with-rho.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/binding-with-rho.yaml
index 42b501f418..5cd3a63865 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/binding-with-rho.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/binding-with-rho.yaml
@@ -1,3 +1,4 @@
+---
 line: 2
 eo: |
   x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/broken-head.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/broken-head.yaml
index f86b026236..9cbdb30f28 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/broken-head.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/broken-head.yaml
@@ -1,3 +1,4 @@
+---
 line: 2
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/comment-in-method.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/comment-in-method.yaml
index 6572a3878b..d246667caf 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/comment-in-method.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/comment-in-method.yaml
@@ -1,3 +1,4 @@
+---
 line: 5
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/double-empty-lines.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/double-empty-lines.yaml
index bf8c8da330..bd5fd49e29 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/double-empty-lines.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/double-empty-lines.yaml
@@ -1,8 +1,9 @@
+---
 line: 4
 eo: |
   # This is the default 64+ symbols comment in front of abstract object.
   [args] > one
-  
-  
+
+
   # This is the default 64+ symbols comment in front of abstract object.
   [] > two
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/double-root-inside-locator.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/double-root-inside-locator.yaml
index 5f6189205f..fddfff0650 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/double-root-inside-locator.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/double-root-inside-locator.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-application.yaml
index bb8afc7844..5b946f0489 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-application.yaml
@@ -1,3 +1,4 @@
+---
 line: 6
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-first-object.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-first-object.yaml
index 35feb56a1e..2c953ef46d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-first-object.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-first-object.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method-2.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method-2.yaml
index f609350e40..3a815fa2c2 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method-2.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method-2.yaml
@@ -1,10 +1,11 @@
+---
 line: 19
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
   [] > main
     # This is the default 64+ symbols comment in front of abstract object
     [] > x
-  
+
     # This is the default 64+ symbols comment in front of abstract object
     [] > y
 
@@ -14,8 +15,8 @@ eo: |
     # This is the default 64+ symbols comment in front of abstract object
     [] > m
     x > a
-  
+
     # This is the default 64+ symbols comment in front of abstract object
     [] > o
-    
+
     o > b
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method.yaml
index 644f01b97b..be91c1e255 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-method.yaml
@@ -1,3 +1,4 @@
+---
 line: 6
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref-deep.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref-deep.yaml
index 17efff002b..721f78f9ab 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref-deep.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref-deep.yaml
@@ -1,3 +1,4 @@
+---
 line: 12
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref.yaml
index 216a41dab1..02ee0fd2dd 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-before-ref.yaml
@@ -1,3 +1,4 @@
+---
 line: 6
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-between-metas.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-between-metas.yaml
index cbe147fdf1..dded2730f1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-between-metas.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-between-metas.yaml
@@ -1,9 +1,10 @@
+---
 line: 3
 eo: |
   +meta smth
-  
+
   +meta other
-  
+
   [] > main
     [] > @
       hello > test
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-in-vertical-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-in-vertical-application.yaml
index e3d1fc4396..9b017ab646 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-in-vertical-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-line-in-vertical-application.yaml
@@ -1,3 +1,4 @@
+---
 line: 5
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-object.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-object.yaml
index 76b0602d4b..a6edacda0a 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/empty-object.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/empty-object.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is wrong
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/hmethod-after-vmethod.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/hmethod-after-vmethod.yaml
index 7e5c03d58a..9beb07de0e 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/hmethod-after-vmethod.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/hmethod-after-vmethod.yaml
@@ -1,4 +1,5 @@
+---
 line: 2
 eo: |
   a
-  .b.c
\ No newline at end of file
+  .b.c
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/invalid-int-literal.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/invalid-int-literal.yaml
index e0ca37072e..b04056d061 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/invalid-int-literal.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/invalid-int-literal.yaml
@@ -1,3 +1,4 @@
+---
 line: 6
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/long-character.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/long-character.yaml
index de9ddb77fa..6499c59cff 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/long-character.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/long-character.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/missing-empty-line-after-metas.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/missing-empty-line-after-metas.yaml
index ae60c561f0..6e85556232 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/missing-empty-line-after-metas.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/missing-empty-line-after-metas.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   +meta smth
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/not-empty-atoms.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/not-empty-atoms.yaml
index e1c1d741ec..d9e3a5c9f2 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/not-empty-atoms.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/not-empty-atoms.yaml
@@ -1,3 +1,4 @@
+---
 line: 4
 eo: |
   # This is the default 64+ symbols comment in front of abstract object.
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/one-space-indent.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/one-space-indent.yaml
index 8474c9a673..88fed99aff 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/one-space-indent.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/one-space-indent.yaml
@@ -1,3 +1,4 @@
+---
 line: 4
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-1.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-1.yaml
index 97bbfdeee0..2d6c37d9f3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-1.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-1.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  (1.add (a.add 5) (4)) > x
\ No newline at end of file
+  (1.add (a.add 5) (4)) > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-2.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-2.yaml
index b367c2eaeb..5ebeb81d4f 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-2.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-2.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  (1.add (a.add 5) 4) > x
\ No newline at end of file
+  (1.add (a.add 5) 4) > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-3.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-3.yaml
index 7b4bb80a60..f8c02876d5 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-3.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-3.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  (1.add (a.add 5) 4)
\ No newline at end of file
+  (1.add (a.add 5) 4)
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-4.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-4.yaml
index b3a4ba8dcc..8894882451 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-4.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-4.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  (1.add 4) > x
\ No newline at end of file
+  (1.add 4) > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-5.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-5.yaml
index fa1eee4f82..d5cb194b2d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-5.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-5.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  (1.add 4)
\ No newline at end of file
+  (1.add 4)
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-6.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-6.yaml
index 37f2faa137..56c765e2b7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-6.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/extra-braces-6.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  ((1.add 1)) > x
\ No newline at end of file
+  ((1.add 1)) > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/just-number.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/just-number.yaml
index 2ab9f917ef..9cf07beec1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/just-number.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/just-number.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  1.add (5) > x
\ No newline at end of file
+  1.add (5) > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/negative-numbers.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/negative-numbers.yaml
index 3c4afdd4f8..3678680d9e 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/negative-numbers.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/negative-numbers.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
-  add (-4) (-5) > x
\ No newline at end of file
+  add (-4) (-5) > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/numbers.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/numbers.yaml
index 4d0a6bbe95..193aac2901 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/numbers.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/numbers.yaml
@@ -1,3 +1,4 @@
+---
 line: 2
 eo: |
   add > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application-named.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application-named.yaml
index 6f4fa2cb33..1b99595f19 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application-named.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application-named.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   1.add 1 > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application.yaml
index 9178b2fe29..8d75fe7f17 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundant-parentheses/simple-application.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   1.add 1 > x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/redundent-parenheses.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/redundent-parenheses.yaml
index 74bbab82b9..c9778f0695 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/redundent-parenheses.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/redundent-parenheses.yaml
@@ -1,3 +1,4 @@
+---
 line: 7
 eo: |
   +home https://github.com/objectionary/eo
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/reversed-as-separate-argument.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/reversed-as-separate-argument.yaml
index dd462a684c..1036910ed3 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/reversed-as-separate-argument.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/reversed-as-separate-argument.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/root-inside-locator.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/root-inside-locator.yaml
index 9bab006bee..2d56669754 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/root-inside-locator.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/root-inside-locator.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/scoped-application-after-suffix.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/scoped-application-after-suffix.yaml
index b213969881..dae8112057 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/scoped-application-after-suffix.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/scoped-application-after-suffix.yaml
@@ -1,5 +1,6 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
   [x] > first
-    a > x (b > x)
\ No newline at end of file
+    a > x (b > x)
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-naming.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-naming.yaml
index c9bd229f10..763ff09fa1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-naming.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-naming.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-tail.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-tail.yaml
index 853a8d4a24..c7beecd763 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-tail.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/space-in-tail.yaml
@@ -1,3 +1,4 @@
+---
 line: 2
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/suffix-with-dots.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/suffix-with-dots.yaml
index 720b0ab77f..0c75ec4be7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/suffix-with-dots.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/suffix-with-dots.yaml
@@ -1,3 +1,4 @@
+---
 line: 2
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/too-far-right-indent.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/too-far-right-indent.yaml
index 4fb5b60e26..55e2042a49 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/too-far-right-indent.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/too-far-right-indent.yaml
@@ -1,3 +1,4 @@
+---
 line: 5
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/trailing-space-in-comment.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/trailing-space-in-comment.yaml
index b5d19ea4e4..1aed28ac57 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/trailing-space-in-comment.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/trailing-space-in-comment.yaml
@@ -1,4 +1,6 @@
+---
 line: 4
+# yamllint disable rule:trailing-spaces
 eo: |
   # This is the default 64+ symbols comment in front of abstract object.
   [] > t
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/varargs-inside.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/varargs-inside.yaml
index ffc4cc90db..52377d0e33 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/varargs-inside.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/varargs-inside.yaml
@@ -1,3 +1,4 @@
+---
 line: 1
 eo: |
   [a b... c] > hello
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/version-with-inline-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/version-with-inline-application.yaml
index ab90787aef..050628bf14 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/version-with-inline-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/version-with-inline-application.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-horizontal-application.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-horizontal-application.yaml
index ff9a93d5ff..8ddb0655e7 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-horizontal-application.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-horizontal-application.yaml
@@ -1,4 +1,5 @@
+---
 line: 1
 eo: |
   x (a
-  .b x)
\ No newline at end of file
+  .b x)
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-scope.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-scope.yaml
index 7e43774612..23c2c1ba86 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-scope.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/vertical-method-in-scope.yaml
@@ -1,4 +1,5 @@
+---
 line: 1
 eo: |
   (a
-  .b c).x
\ No newline at end of file
+  .b c).x
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-happlication.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-happlication.yaml
index 5082580001..8d5fc7bafb 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-happlication.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-happlication.yaml
@@ -1,4 +1,5 @@
+---
 line: 2
 eo: |
   x y
-  .z
\ No newline at end of file
+  .z
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-hmethod.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-hmethod.yaml
index 0c6250bad7..617132bd41 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-hmethod.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/vmethod-after-hmethod.yaml
@@ -1,4 +1,5 @@
+---
 line: 2
 eo: |
   x.y
-  .z
\ No newline at end of file
+  .z
diff --git a/eo-parser/src/test/resources/org/eolang/parser/typos/xi-inside-locator.yaml b/eo-parser/src/test/resources/org/eolang/parser/typos/xi-inside-locator.yaml
index d449dbb913..0d33aae1aa 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/typos/xi-inside-locator.yaml
+++ b/eo-parser/src/test/resources/org/eolang/parser/typos/xi-inside-locator.yaml
@@ -1,3 +1,4 @@
+---
 line: 3
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs-with-dot.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs-with-dot.yml
index 3d15c202ea..c9eb2daf1d 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs-with-dot.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs-with-dot.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/set-locators.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs.yml
index 8a73cdc95d..81b4123e56 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/add-locs.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/set-locators.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/add-refs.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/add-refs.yml
index 962e0b050c..5ded5e22b8 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/add-refs.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/add-refs.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/add-refs.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-correct.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-correct.yml
index f553c40841..5da56e73a6 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-correct.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-correct.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/errors/zero-version.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-main.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-main.yml
index 82b9126d1b..03576f60b1 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-main.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-main.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/errors/zero-version.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-test.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-test.yml
index bbd8c29c4a..bb50eb814c 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-test.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-incorrect-for-test.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/errors/zero-version.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-no-version.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-no-version.yml
index 96c57257ea..fe054d5c05 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-no-version.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-no-version.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/errors/zero-version.xsl
 document:
diff --git a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-not-applicable-source.yml b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-not-applicable-source.yml
index d44a7a623c..2c55023aec 100644
--- a/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-not-applicable-source.yml
+++ b/eo-parser/src/test/resources/org/eolang/parser/xax/zero-version-not-applicable-source.yml
@@ -1,3 +1,4 @@
+---
 sheets:
   - /org/eolang/parser/errors/zero-version.xsl
 document: