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Test that IGzipFile compresses with isal_zlib at the given level #308

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Merged
rhpvorderman merged 2 commits into from
Nov 2, 2026
Merged

Test that IGzipFile compresses with isal_zlib at the given level #308

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a9e6da0
Test that IGzipFile compresses with isal_zlib at the given level
ptweezy Oct 27, 2026
a751682
Check the arguments IGzipFile passes to compressobj, not the output
ptweezy Nov 2, 2026
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17 changes: 17 additions & 0 deletions tests/test_igzip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,23 @@ def test_repr(tmp_path):
assert "<igzip _io.BufferedWriter name='" in repr(test)


@pytest.mark.parametrize("level", range(4))
def test_igzipfile_compressobj_parameters(monkeypatch, level):
calls = []
compressobj = isal_zlib.compressobj

def recording_compressobj(*args, **kwargs):
calls.append((args, kwargs))
return compressobj(*args, **kwargs)

monkeypatch.setattr(isal_zlib, "compressobj", recording_compressobj)
with igzip.IGzipFile(fileobj=io.BytesIO(), mode="wb",
compresslevel=level) as f:
assert isinstance(f.compress, isal_zlib.Compress)
assert calls == [((level, isal_zlib.DEFLATED, -isal_zlib.MAX_WBITS,
isal_zlib.DEF_MEM_LEVEL, 0), {})]


def test_write_readonly_file():
with igzip.IGzipFile(TEST_FILE, "rb") as test:
with pytest.raises(OSError) as error:
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