def test_create_empty_stack(self):
stack = StackArray()
self.assertEqual('', str(stack))
def test_push_pop_from_empty_to_empty_stack(self):
stack = StackArray()
stack.push(1)
stack.pop()
stack.push(1)
stack.push(2)
stack.push(3)
stack.push(4)
stack.push(5)
stack.push(6)
stack.push(7)
stack.push(8)
stack.push(9)
self.assertEqual('1, 2, 3, 4, 5, 6, 7, 8, 9', str(stack))
stack.pop()
stack.push(9)
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
self.assertEqual('', str(stack))
def test_count_stack_empty_stack(self):
stack = StackArray()
self.assertEqual(0, stack.count())
def test_clear_stack(self):
stack = StackArray([9])
stack.clear()
self.assertEqual(0, stack.count())
self.assertEqual('', str(stack))
def test_count_stack(self):
stack = StackArray([4, 9])
self.assertEqual(2, stack.count())
def test_peek_empty_stack(self):
stack = StackArray()
with self.assertRaises(ValueError):
stack.peek()
self.assertEqual('', str(stack))
def test_peek_non_empty_stack(self):
stack = StackArray([4, 9])
value = stack.peek()
self.assertEqual('4, 9', str(stack))
self.assertEqual('9', str(value))
def test_push_on_non_empty_stack(self):
stack = StackArray([4, 9])
stack.push(6)
self.assertEqual('4, 9, 6', str(stack))
def test_create_stack_from_content(self):
stack = StackArray([5, 8, 9])
self.assertEqual('5, 8, 9', str(stack))