test_codecs.py 文件源码

def test_seek(self):
        # all codecs should be able to encode these
        s = "%s\n%s\n" % (100*"abc123", 100*"def456")
        for encoding in all_unicode_encodings:
            if encoding == "idna": # FIXME: See SF bug #1163178
                continue
            if encoding in broken_unicode_with_stateful:
                continue
            reader = codecs.getreader(encoding)(io.BytesIO(s.encode(encoding)))
            for t in range(5):
                # Test that calling seek resets the internal codec state and buffers
                reader.seek(0, 0)
                data = reader.read()
                self.assertEqual(s, data)