Fix test on Windows

[devhl-labs]

Fixes #19924

@joscha Pinging author of these tests for awareness

Here are the logs produced by ./mvnw clean package

[ERROR] Failures:
[ERROR] org.openapitools.codegen.DefaultCodegenTest.testExecutePostProcessor
[ERROR] Run 1: DefaultCodegenTest.testExecutePostProcessor:755 expected [true] but found [false]
[ERROR] Run 2: DefaultCodegenTest.testExecutePostProcessor:755 expected [true] but found [false]
[ERROR] Run 3: DefaultCodegenTest.testExecutePostProcessor:755 expected [true] but found [false]
[INFO]
[INFO]
[ERROR] Tests run: 3214, Failures: 1, Errors: 0, Skipped: 4

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh ./bin/configs/*.yaml
  ./bin/utils/export_docs_generators.sh
  

  (For Windows users, please run the script in Git BASH)
  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
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[joscha]

Can we find an execution that works for both windows and *nix or add an if/else in the test for the system instead of commenting it out?

[devhl-labs]

I don't expect to troubleshoot this anytime soon but if you want to send a pr ill tell you if it works for me. Otherwise we should comment it out until we fix it. Also, maybe there should be a pr gate that runs the tests on windows.

[joscha]

Can you execute the commands behind call 2 and 3 on Windows and let me know what they yield, please? I do not have access to Windows unfortunately.

Agree with the CI step on Windows. I was under the impression this is something we do already.

[devhl-labs]

They are all false.

Oh I see, stepping into it more I see this error. I tried changing echo to Write-Host and it still fails. Not sure what else to try.
"Cannot run program "echo": CreateProcess error=2, The system cannot find the file specified"

[joscha]

Is there no echo on modern windows anymore maybe? I think this needs Windows to debug it.

[wing328]

We do have workflow to test on windows: https://github.com/OpenAPITools/openapi-generator/blob/master/.github/workflows/windows.yaml

mvn clean pacakge also works fine in my Windows box (JDK17)

[devhl-labs]

I fixed it

[joscha]

Thank you.