def test_equals_2(self): self.assertEqual(triangular(2), 3)
def test_equals(self): self.assertEqual(triangular(0), 0)
def test_equals_4(self): self.assertEqual(triangular(-10), 0)
def test_equals_5(self): self.assertEqual(triangular(613827063227449), 188391831775217643091685137525)
def test_equals_3(self): self.assertEqual(triangular(3), 6)