fix: IntegerProperty now accepts long type for Python 2.7. (#262)

Fixes #250.

Author: Chris Rossi

packages/google-cloud-ndb/google/cloud/ndb/model.py

@@ -2272,7 +2272,7 @@ def _validate(self, value):
             .BadValueError: If ``value`` is not an :class:`int` or convertible
                 to one.
         """
-        if not isinstance(value, int):
+        if not isinstance(value, six.integer_types):
             raise exceptions.BadValueError(
                 "Expected integer, got {!r}".format(value)
             )

packages/google-cloud-ndb/tests/unit/test_model.py

@@ -1517,6 +1517,13 @@ def test__validate():
         value = 829038402384
         assert prop._validate(value) is value
 
+    @staticmethod
+    @pytest.mark.skipif(six.PY3, reason="Test for Python 2 only.")
+    def test__validate_long():  # pragma: NO PY3 COVER
+        prop = model.IntegerProperty(name="count")
+        value = long(829038402384)  # noqa F821
+        assert prop._validate(value) is not value
+
     @staticmethod
     def test__validate_bool():
         prop = model.IntegerProperty(name="count")