def test_set_bytes(self) -> None:
bytes_a = b"test bytes first set"
bytes_b = b"the second set of bytes"
e = DataMemoryElement(bytes_a)
self.assertEqual(e.get_bytes(), bytes_a)
e.set_bytes(bytes_b)
self.assertEqual(e.get_bytes(), bytes_b)
def test_load_as_matrix_invalid_bytes(self):
"""
Test that data element with invalid data bytes fails to load.
"""
d = DataMemoryElement(content_type='image/png')
d.set_bytes(b"not valid bytes")
inst = PilImageReader()
with pytest.raises(IOError,
match="Failed to identify image from bytes "
"provided by DataMemoryElement"):
inst.load_as_matrix(d)