def test_stack_push_pop_ordering(self):
s1 = Stack()
s2 = s1.push(1)
s3 = s2.push(10)
s4 = s3.push(100)
(sv4, s5) = s4.pop()
(sv3, s6) = s5.pop()
self.assertEqual(100, sv4)
self.assertEqual(10, sv3)
self.assertEqual(100, s4.pop()[0])
def test_stack_push_pop_ordering(self):
s1 = Stack()
s2 = s1.push(1)
s3 = s2.push(10)
s4 = s3.push(100)
(sv4, s5) = s4.pop()
(sv3, s6) = s5.pop()
self.assertEqual(100, sv4)
self.assertEqual(10, sv3)
self.assertEqual(100, s4.pop()[0])
def test_stack_iterator(self):
self.assertEqual([10, 5, 1], list(Stack().push(1).push(5).push(10)))
self.assertEqual(6, sum(Stack().push(1).push(2).push(3)))
def test_pop_empty_stack_exception(self):
self.assertRaises(ValueError, Stack().pop)
def test_stack_is_empty_check(self):
self.assertTrue(Stack().push(100))
self.assertFalse(Stack().push(100).is_empty())
self.assertTrue(Stack().is_empty())
def test_stack_length(self):
self.assertEqual(0, len(Stack()))
self.assertEqual(3, len(Stack().push(1).push(2).push(3)))
