Read UTF-8 test fixtures with explicit encoding - #3245
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maxisbey merged 1 commit intoAug 14, 2026
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Path.read_text() without an encoding argument uses the locale preferred encoding, which on Windows is the ANSI code page (e.g. GBK on Chinese-locale systems). manifest.toml and the story sources are UTF-8, so tests/examples failed to collect or run there. Fixes modelcontextprotocol#3244 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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maxisbey
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Aug 14, 2026
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Summary
Fixes #3244.
Two Path.read_text() calls in tests/examples omit the encoding argument, so they decode with the locale preferred encoding - on Windows that is the ANSI code page. On non-Western-locale Windows (e.g. Chinese locale, cp936/GBK) this raises UnicodeDecodeError: tests/examples/conftest.py:41 fails at collection (8 collection errors blocking the whole directory) and tests/examples/test_story_shape.py:30 fails ~70 parametrized tests. CI's windows-latest uses cp1252, which happens to decode the same bytes without raising, so this only reproduces on non-Western locales.
Both files being read (manifest.toml, story sources) are UTF-8 - TOML is UTF-8 by specification - so this passes encoding=utf-8 explicitly at both call sites.
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Disclosure
This fix was prepared with AI assistance (Claude Code); I have reviewed and verified the change myself.
🤖 Generated with Claude Code