def test_raises_if_bad_tag():
"""Check that assertions are raised if compressed data isn't tagged."""
scheme = ZlibPlcdScheme('x_v1', '')
with pytest.raises(ValueError):
scheme.decompress('')
def test_compress_and_decompress():
"""Test that decompress(compress(x)) == x."""
scheme = ZlibPlcdScheme('hi', 'fandangle')
for input_str in ('catfood', 'fandangle2'):
compressed = scheme.compress(input_str)
assert scheme.decompress(compressed) == input_str