def test_decode_watermark_appended():
watermark_uuid = uuid.uuid4()
watermark = uuid_to_watermark(watermark_uuid)
text = 'asdf'
assert decode_watermark(''.join((text, watermark))) == (
text,
watermark_uuid,
)
def test_decode_watermark_returns_original_encoded_text_if_too_short():
encoded_text = 'asdf'
assert decode_watermark(encoded_text) == (encoded_text, None)
def test_decode_watermark_returns_original_encoded_text_if_no_watermark():
encoded_text = 'a' * 65
assert decode_watermark(encoded_text) == (encoded_text, None)
def test_decode_watermark_requires_unicode_encoded_text():
with pytest.raises(ValueError) as excinfo:
decode_watermark(b'bytestring')
excinfo.match('text must be a unicode string')