`tests/util`: Implement enhancements of `CmdResult` #4259#4261

Merged

tertsdiepraam merged 6 commits intouutils:mainfrom Joining7943:tests-util-enhance-cmdresult

Jan 25, 2023

+779-432

Commits on Jan 22, 2023

tests/util: Introduce CmdResult::stdout_str_apply ... to preprocess stdout, stderr before asserting
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tests/util: Use ExitStatus instead of code, success in CmdResult. Rewrite tests for CmdResult
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tests/util: Add methods in CmdResult to assert the received signal on unix systems
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tests/util: Add stdout_check, stdout_str_check ... to CmdResult to run arbitrary assertions
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tests/util: Do not trim stderr in CmdResult::stderr_is. Add method stderr_trimmed_is.
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tests/util: Improve assertion messages of CmdResult::stderr_is_bytes, stdout_is_bytes
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