Incorrect checkstyle output on success

[oliv3r]

• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Expected behavior

When a file is properly linted, the tested (and passing) file should still be shown/included.

<?xml version='1.0' encoding='UTF-8'?>
<checkstyle version='4.3'>
</checkstyle>

This is also important, and becomes an issue, when converting it to junit using an xslt, which then produces:

<?xml version="1.0" encoding="UTF-8"?>
<testsuite tests="0" failures="0"/>

which obviously is incorrect, as we pretend we ran zero tests, but we did run tests.

Actual behavior

Comparing this to for example shellcheck's output, we see

<checkstyle version="4.3">
<file name="/builds/.../test/pass.sh"> </file>
</checkstyle>

Which then converts to

<testsuite tests="1" failures="0">
<testcase classname="/builds/.../test/pass.sh" name="/builds/.../pass.sh"> </testcase>
</testsuite>

Note that the number of tests.

Steps to reproduce the behavior

hadolint --format=checkstyle Dockerfile

Haskell Dockerfile Linter 2.12.1

Dockerfile (if relevant)

FROM scratch