def test_equals(self): self.assertEqual(increment_string('foo'), 'foo1')
def test_equals_2(self): self.assertEqual(increment_string('foobar23'), 'foobar24')
def test_equals_9(self): self.assertEqual(increment_string('foobar99'), 'foobar100')
def test_equals_10(self): self.assertEqual(increment_string(''), '1')
def test_equals_8(self): self.assertEqual(increment_string('foobar1'), 'foobar2')
def test_equals_7(self): self.assertEqual(increment_string('foobar001'), 'foobar002')
def test_equals_5(self): self.assertEqual(increment_string('foo099'), 'foo100')
def test_equals_4(self): self.assertEqual(increment_string('foo9'), 'foo10')
def test_equals_3(self): self.assertEqual(increment_string('foo0042'), 'foo0043')