Method test_peek

Lib/test/test_gzip.py:481–501

(self)

            self.assertEqual(f.read(), uncompressed)

    def test_peek(self):
        uncompressed = data1 * 200
        with gzip.GzipFile(self.filename, "wb") as f:
            f.write(uncompressed)

        def sizes():
            while True:
                for n in range(5, 50, 10):
                    yield n

        with gzip.GzipFile(self.filename, "rb") as f:
            f.max_read_chunk = 33
            nread = 0
            for n in sizes():
                s = f.peek(n)
                if s == b'':
                    break
                self.assertEqual(f.read(len(s)), s)
                nread += len(s)
            self.assertEqual(f.read(100), b'')
            self.assertEqual(nread, len(uncompressed))

    def test_textio_readlines(self):
        # Issue #10791: TextIOWrapper.readlines() fails when wrapping GzipFile.