diff --git a/help/to-csv.sh b/help/to-csv.sh
index d08cede7..50500e15 100755
--- a/help/to-csv.sh
+++ b/help/to-csv.sh
@@ -27,4 +27,4 @@ set -o pipefail
 # suitable for CSV: replacing commas.
 
 data=$(cat)
-printf '%s' "${data}" | sed 's/,/\\,/'
\ No newline at end of file
+printf '%s' "${data}" | sed 's/,/\\,/g'
\ No newline at end of file
diff --git a/tests/help/test-to-csv.sh b/tests/help/test-to-csv.sh
new file mode 100755
index 00000000..2031ab62
--- /dev/null
+++ b/tests/help/test-to-csv.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# The MIT License (MIT)
+#
+# Copyright (c) 2021-2024 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+set -e
+set -o pipefail
+
+stdout=$2
+
+test "$(echo 'a b c' | "${LOCAL}/help/to-csv.sh")" = 'a b c' > "${stdout}"
+echo "👍🏻 Correctly formatted simple text"
+
+test "$(echo 'a,b,c' | "${LOCAL}/help/to-csv.sh")" = 'a\,b\,c' > "${stdout}"
+echo "👍🏻 Correctly formatted commas"
diff --git a/tests/steps/test-aggregate-repo.sh b/tests/steps/test-aggregate-repo.sh
index 16d72c20..fc90aa83 100755
--- a/tests/steps/test-aggregate-repo.sh
+++ b/tests/steps/test-aggregate-repo.sh
@@ -26,8 +26,8 @@ set -o pipefail
 stdout=$2
 
 {
-    repo="foo/bar test ; "
-    dir="${TARGET}/measurements/${repo}/a"
+    repo="foo/bar test, ; "
+    dir="${TARGET}/measurements/${repo}/a, ; -"
     mkdir -p "${dir}"
     m="Foo,- ;Bar.java.m"
     touch "${dir}/${m}"
@@ -37,11 +37,11 @@ stdout=$2
     test "$(echo "${msg}" | grep -c "sum=0")" == 0
     test "$(echo "${msg}" | grep -c "files=0")" == 0
     test -e "${TARGET}/data/${repo}/all.csv"
-    grep "/a/Foo\\\\,- ;Bar.java,42,0.75" "${TARGET}/data/${repo}/all.csv"
+    grep "/a\\\\, ; -/Foo\\\\,- ;Bar.java,42,0.75" "${TARGET}/data/${repo}/all.csv"
     grep "java_file,loc,nhd" "${TARGET}/data/${repo}/all.csv"
     test -e "${TARGET}/data/${repo}/loc.csv"
     grep "java_file,loc" "${TARGET}/data/${repo}/loc.csv"
-    grep "/a/Foo\\\\,- ;Bar.java,42" "${TARGET}/data/${repo}/loc.csv"
+    grep "/a\\\\, ; -/Foo\\\\,- ;Bar.java,42" "${TARGET}/data/${repo}/loc.csv"
     test -e "${TARGET}/data/${repo}/nhd.csv"
     grep ",42" "${TARGET}/data/${repo}/loc.csv"
 } > "${stdout}" 2>&1