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Allow mypy to output a junit file with per-file results #16388

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merged 1 commit into from
Nov 3, 2023

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@mrwright mrwright commented Nov 1, 2023

Adds a new --junit-format flag to MyPy, which affects the structure of the junit file written when --junit-xml is specified (it has no effect when not writing a junit file). This flag can take global or per_file as values:

  • --junit-format=global (the default) preserves the existing junit structure, creating a junit file specifying a single "test" for the entire mypy run.
  • --junit-format=per_file will cause the junit file to have one test entry per file with failures (or a single entry, as in the existing behavior, in the case when typechecking passes).

In some settings it can be useful to know which files had typechecking failures (for example, a CI system might want to display failures by file); while that information can be parsed out of the error messages in the existing junit files, it's much more convenient to have that represented in the junit structure.

Tests for the old and new junit structure have been added.

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github-actions bot commented Nov 1, 2023

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

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@JukkaL JukkaL left a comment

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Looks good. I can see how the per-file format can be help in CI.

@JukkaL JukkaL merged commit 8c57df0 into python:master Nov 3, 2023
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@mrwright mrwright deleted the junit-format branch November 3, 2023 14:35
mrwright added a commit to mrwright/mypy that referenced this pull request Nov 6, 2023
msullivan pushed a commit that referenced this pull request Nov 7, 2023
#16388 introduced a bug where, with `--junit-format=global`, the junit
file would indicate an error (with no message) even if everything
passed. That was because `_generate_junit_contents` would check if
`messages_by_file` was empty or not to determine if there were failures,
but with `--junit-format=global` we'd pass in a dictionary of the form
`{None: all_messages}`; `all_messages` would be empty, but the resulting
dictionary wouldn't be.

The fix is to pass in an empty dictionary if there are no messages.

I've tested manually with `--junit-format=global` and
`--junit-format=per_file` in the successful case to make sure the files
are written correctly now.
svalentin added a commit that referenced this pull request Nov 8, 2023
#16388 changed the definition of
`write_junit_xml` but missed a call site in dmypy. This fixes it.
JelleZijlstra pushed a commit that referenced this pull request Jan 2, 2024
#16388 introduced a bug where invalid xml could be produced by
`write_junit_xml`, as special characters were no longer being escaped.

The fix is to revert the removal of `from xml.sax.saxutils import
escape` and `escape("\n".join(messages))` in the `write_junit_xml`
function.

I've added a small test case which checks that the `<`, `>`, `&` are
escaped correctly in the xml.
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2 participants