TST: Add true_divide and floor_divide tests for the mm_d timedelta case

Author: mwiebe

numpy/core/tests/test_datetime.py

@@ -924,6 +924,9 @@ def test_datetime_divide(self):
             assert_equal((tda / 0.5).dtype, np.dtype('m8[h]'))
             # m8 / m8
             assert_equal(tda / tdb, 6.0 / 9.0)
+            assert_equal(np.divide(tda, tdb), 6.0 / 9.0)
+            assert_equal(np.true_divide(tda, tdb), 6.0 / 9.0)
+            assert_equal(np.floor_divide(tda, tdb), 6.0 / 9.0)
             assert_equal(tdb / tda, 9.0 / 6.0)
             assert_equal((tda / tdb).dtype, np.dtype('f8'))
             assert_equal(tda / tdd, 60.0)