def test_clear_stack(self):
stack = Stack()
stack.push("item1")
stack.push("item2")
stack.push("item3")
assert len(stack) > 0
assert len(stack) == 3
stack.clear()
assert len(stack) == 0
def testStack(self):
stack = Stack()
self.assertTrue(stack.isEmpty())
stack.push(5)
self.assertFalse(stack.isEmpty())
stack.clear()
self.assertTrue(stack.isEmpty())
stack.push(6)
self.assertEqual(6, stack.top())
self.assertEqual(6, stack.pop())
self.assertTrue(stack.isEmpty())
stack.push(7)
stack.push(6)
stack.push(5)
self.assertEqual(5, stack.pop())
self.assertEqual(6, stack.pop())
self.assertEqual(7, stack.top())
def testStack(self):
stack = Stack()
self.assertTrue(stack.isEmpty())
stack.push(5)
self.assertFalse(stack.isEmpty())
stack.clear()
self.assertTrue(stack.isEmpty())
stack.push(6)
self.assertEqual(6, stack.top())
self.assertEqual(6, stack.pop())
self.assertTrue(stack.isEmpty())
stack.push(7)
stack.push(6)
stack.push(5)
self.assertEqual(5, stack.pop())
self.assertEqual(6, stack.pop())
self.assertEqual(7, stack.top())
