def test_init_validation(self, validate):
"""Should validate DTM when initialized."""
DTM.copy(self.dtm1)
validate.assert_called_once_with()
def test_init_dtm(self):
"""Should copy DTM if passed into DTM constructor."""
new_dtm = DTM.copy(self.dtm1)
self.assert_is_copy(new_dtm, self.dtm1)