def test_sha2_string_hash_len_default(self):
string = 'A string'
Alphabet.objects.create(d=string)
pysha512 = hashlib.sha512(string.encode('ascii')).hexdigest()
ab = Alphabet.objects.annotate(sha=SHA2('d')).first()
assert ab.sha == pysha512
def test_sha2_bad_hash_len(self):
with pytest.raises(ValueError):
SHA2('a', 123)
