mill.scalalib.checkstyle.CheckstyleModuleTest always fails

[lefou]

Reproduce:

> mill -j1 scalalib.test.testOnly mill.javalib.checkstyle.CheckstyleModuleTest
...
[1444] mill.testkit.UnitTester: running checkstyle ...
[1444] Checkstyle endet mit 2 Fehlern.
[1444] mill.testkit.UnitTester: checkstyle output report at /home/lefou/work/opensource/mill/out/scalalib/test/testOnly.dest/sandbox/out/mill-test-base-module/16381572422961682342/out/checkstyleOutput.dest/checkstyle-output.xml
[1444] mill.testkit.UnitTester: checkstyle found 2 violation(s)
[1444] X mill.javalib.checkstyle.CheckstyleModuleTest.arguments.sources 1042ms 
[1444]   utest.AssertionError: #1: testJava(
[1444]               resources / "non-compatible",
[1444]               violations = violations.take(2),
[1444]               sources = Seq("src/blocks")
[1444]             )
[1444]   resources: os.Path = /home/lefou/work/opensource/mill/scalalib/test/resources/checkstyle
[1444]   violations: Seq[String] = List(Array should contain trailing comma, Array should contain trailing comma, Empty statement, Empty statement)
[1444]     utest.asserts.Asserts$.assertImpl(Asserts.scala:30)
[1444]     mill.javalib.checkstyle.CheckstyleModuleTest$.tests$$anonfun$1$$anonfun$1$$anonfun$3(CheckstyleModuleTest.scala:12)
...
[1444] mill.testkit.UnitTester: running checkstyle ...
[1444] Checkstyle endet mit 4 Fehlern.
[1444] mill.testkit.UnitTester: checkstyle output report at /home/lefou/work/opensource/mill/out/scalalib/test/testOnly.dest/sandbox/out/mill-test-base-module/8340530497038255299/out/checkstyleOutput.dest/checkstyle-output.plain
[1444] mill.testkit.UnitTester: checkstyle found 4 violation(s)
[1444] X mill.javalib.checkstyle.CheckstyleModuleTest.settings.format 976ms 
[1444]   utest.AssertionError: #1: testJava(resources / "non-compatible", "plain", violations = violations)
[1444]   resources: os.Path = /home/lefou/work/opensource/mill/scalalib/test/resources/checkstyle
[1444]   violations: Seq[String] = List(Array should contain trailing comma, Array should contain trailing comma, Empty statement, Empty statement)
[1444]     utest.asserts.Asserts$.assertImpl(Asserts.scala:30)
[1444]     mill.javalib.checkstyle.CheckstyleModuleTest$.tests$$anonfun$1$$anonfun$2$$anonfun$1(CheckstyleModuleTest.scala:12)
...
[1444] mill.testkit.UnitTester: running checkstyle ...
[1444] mill.testkit.UnitTester: checkstyle output report at /home/lefou/work/opensource/mill/out/scalalib/test/testOnly.dest/sandbox/out/mill-test-base-module/13753980815456980494/out/checkstyleOutput.dest/checkstyle-output.plain
[1444] mill.testkit.UnitTester: checkstyle found 1 violation(s)
[1444] X mill.javalib.checkstyle.CheckstyleModuleTest.limitations.incompatible version generates report with unexpected violation 392ms 
[1444]   utest.AssertionError: #1: testJava(
[1444]               resources / "compatible-java",
[1444]               "plain",
[1444]               "6.2",
[1444]               violations = Seq("File not found")
[1444]             )
[1444]   resources: os.Path = /home/lefou/work/opensource/mill/scalalib/test/resources/checkstyle
[1444]     utest.asserts.Asserts$.assertImpl(Asserts.scala:30)
[1444]     mill.javalib.checkstyle.CheckstyleModuleTest$.tests$$anonfun$1$$anonfun$3$$anonfun$1(CheckstyleModuleTest.scala:12)
...
1 tasks failed
scalalib.test.testOnly 3 tests failed: 
  mill.javalib.checkstyle.CheckstyleModuleTest mill.javalib.checkstyle.CheckstyleModuleTest.arguments.sources
  mill.javalib.checkstyle.CheckstyleModuleTest mill.javalib.checkstyle.CheckstyleModuleTest.settings.format
  mill.javalib.checkstyle.CheckstyleModuleTest mill.javalib.checkstyle.CheckstyleModuleTest.limitations.incompatible version generates report with unexpected violation

[lefou]

On my local machine, this seems to be a locale issue. But it also failed on CI.