def test_compose_should_return_same_value(self):
self.assertEqual(compose(lambda x: x)('z4r4tu5str4'), 'z4r4tu5str4')
def test_compose_verifying_the_execution_order(self):
foo = lambda x: x * x
bar = lambda x: x + 42
self.assertEqual(compose(foo, bar)(7), foo(bar(7)))
def test_compose_should_return_a_callable(self):
composed_functions = compose(lambda x: x, lambda y: y)
self.assertTrue(hasattr(composed_functions, '__call__'))