gh-131697: Test reproducible gzip output metadata#151214
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Adds regression tests for gzip's reproducible output metadata. gh-131697 asked for a fragile reproducibility test so the gh-112346 regression (3.10→3.11) can't recur silently.
The test asserts the gzip header/footer metadata is fixed and deterministic across the main code paths —
gzip.compress(default and explicitmtime=0),GzipFile,gzip.open, and aw:gztarfile — checking the output is byte-identical across two runs and that the header records mtime 0, the "unknown" OS byte (255), and the correct ISIZE. Tests-only; includes a Tests NEWS entry.Disclosure: AI-assisted; I've reviewed the tests.
gzip.compress()#131697