def test_equals_12(self):
     self.assertEqual(right("Don't Repeat Yourself", 'Repeat '), 'Yourself')
 def test_equals_8(self):
     self.assertEqual(right(self.text), '!')
 def test_equals_10(self):
     self.assertEqual(right(self.text, 'o'), 'rld!')
 def test_equals_7(self):
     self.assertEqual(right(self.text, 6), 'World!')