Class FakeCompressor

Lib/test/test_gzip.py:859–866

        # Make sure the argument to flush is properly passed to the
        # zlib.compressobj; see issue GH-105808.
        class FakeCompressor:
            def __init__(self):
                self.modes = []
            def compress(self, data):
                return b''
            def flush(self, mode=-1):
                self.modes.append(mode)
                return b''
        b = io.BytesIO()
        fc = FakeCompressor()
        with gzip.GzipFile(fileobj=b, mode='w') as f: