def test_equal_2(self): self.assertEqual(reverse_complement('GACTGACTGTA'), 'TACAGTCAGTC')
def test_equal_4(self): self.assertEqual(reverse_complement('XYZ'), 'Invalid sequence')
def test_equal_1(self): self.assertEqual(reverse_complement('TTCCGGAA'), 'TTCCGGAA')
def test_equal_3(self): self.assertEqual(reverse_complement(''), '')