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Fix serialization of str subclasses in subtest msg parameter - #15134
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014AXM2385U5x4VaR1ppeo4X
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A str subclass passed as the subtest msg, such as a StrEnum member, was stored on the report as-is. execnet serializes by exact type, so pytest-xdist failed with "DumpError: can't serialize <enum ...>". Convert such messages with str.__str__ in SubtestContext, next to the existing saferepr handling of kwargs. str.__str__ keeps the string data; str() on a (str, Enum) mixin would give "Cls.MEMBER". Refs pytest-dev/pytest-xdist#1161. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014AXM2385U5x4VaR1ppeo4X
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Requested by Ronny · project thread
🤖 Written by Claude Opus 5.5 via Claude Code for the pytest maintainers; I prompted it, it did the work, I read it.
Reports must be serializable, so the report producer is responsible for handing over plain data.
SubtestContextalready does this forkwargs(#13963), andTestCase.subTestconverts its message (#14196). The nativesubtests.test(msg=...)path did not: astrsubclass such as aStrEnummember stayed on the report, and pytest-xdist failed withDumpError: can't serialize <enum ...>.SubtestContextnow convertsstrsubclasses to plainstrviastr.__str__, which keeps the string data (str()on a(str, Enum)mixin would yield"Cls.MEMBER").Fixes pytest-dev/pytest-xdist#1161, in place of the xdist-side workaround in pytest-dev/pytest-xdist#1389.
🤖 Generated with Claude Code
https://claude.ai/code/session_014AXM2385U5x4VaR1ppeo4X