def test_identity_serializer_with_custom_content_type():
identity_serializer = IdentitySerializer(content_type="text/csv")
assert identity_serializer.serialize(b"a,b\n1,2") == b"a,b\n1,2"
assert identity_serializer.CONTENT_TYPE == "text/csv"
def test_identity_serializer():
identity_serializer = IdentitySerializer()
assert identity_serializer.serialize(b"{}") == b"{}"