Add parameterized test for from_rfc3339 with nanos (#7675)

* Add parameterized test for from_rfc3339 with nanos

Author: crwilcox

tests/unit/test_datetime_helpers.py

@@ -269,6 +269,24 @@ def test_from_rfc3339_w_full_precision():
  stamp = datetime_helpers.DatetimeWithNanoseconds.from_rfc3339(timestamp)
  assert stamp == expected
 
+ @staticmethod
+ @pytest.mark.parametrize(
+ "fractional, nanos",
+ [
+ ("12345678", 123456780),
+ ("1234567", 123456700),
+ ("123456", 123456000),
+ ("12345", 123450000),
+ ("1234", 123400000),
+ ("123", 123000000),
+ ("12", 120000000),
+ ("1", 100000000),
+ ],
+ )
+ def test_from_rfc3339_test_nanoseconds(fractional, nanos):
+ value = "2009-12-17T12:44:32.{}Z".format(fractional)
+ assert datetime_helpers.DatetimeWithNanoseconds.from_rfc3339(value).nanosecond == nanos
+
  @staticmethod
  def test_timestamp_pb_wo_nanos_naive():
  stamp = datetime_helpers.DatetimeWithNanoseconds(