import zlib

DATA = b'nyan' * 16
COMPRESSED = zlib.compress(DATA)
TEST_INPUT = COMPRESSED + DATA

d = zlib.decompressobj()
for i in range(len(TEST_INPUT)):
    d.decompress(TEST_INPUT[i : i + 1])

if d.unused_data == DATA:
    print('OK: d.unused_data matches DATA')
else:
    print('FAIL:')
    print('  d.unused_data = %r' % (d.unused_data,))
    print('  [expected %r]' % (DATA,))