Added Period tests for more datetime64 dtypes

Author: jcrist

pandas/tseries/tests/test_period.py

@@ -227,8 +227,12 @@ def test_period_constructor(self):
         i1 = Period(date(2007, 1, 1), freq='M')
         i2 = Period(datetime(2007, 1, 1), freq='M')
         i3 = Period(np.datetime64('2007-01-01'), freq='M')
+        i4 = Period(np.datetime64('2007-01-01 00:00:00Z'), freq='M')
+        i5 = Period(np.datetime64('2007-01-01 00:00:00.000Z'), freq='M')
         self.assertEqual(i1, i2)
-        self.assertEqual(i2, i3)
+        self.assertEqual(i1, i3)
+        self.assertEqual(i1, i4)
+        self.assertEqual(i1, i5)
 
         i1 = Period('2007-01-01 09:00:00.001')
         expected = Period(datetime(2007, 1, 1, 9, 0, 0, 1000), freq='L')