def test_stack_copy(self):
s = Stack([1, 2, 3])
c = s.copy()
s.push(4)
c.push(5)
actual = '{} {}'.format(s, c)
expected = 'Stack(1, 2, 3, 4 ↔) Stack(1, 2, 3, 5 ↔)'
self.assertEqual(expected, actual)
def test_stack_peek(self):
s = Stack()
s.push(1)
s.push(2)
p = s.peek()
actual = '{} {}'.format(p, s)
expected = '2 Stack(1, 2 ↔)'
self.assertEqual(expected, actual)
def test_bounded_stack(self):
s = Stack(maxlen=2)
s.push(1)
s.push(2)
s.push(3)
n = len(s)
out = s.pop()
actual = '{} {} {}'.format(n, out, s)
expected = '2 3 Stack(2 ↔)'
self.assertEqual(expected, actual)
def test_stack(self):
s = Stack()
s.push(1)
s.push(2)
s.push(3)
n = len(s)
out = s.pop()
actual = '{} {} {}'.format(n, out, s)
expected = '3 3 Stack(1, 2 ↔)'
self.assertEqual(expected, actual)
def test_empty_stack(self):
self.assertEqual('Stack()', str(Stack()))
def test_stack_iter(self):
actual = list(Stack([1, 2, 3]))
expected = [1, 2, 3]
self.assertEqual(expected, actual)
def test_stack_reversed(self):
actual = list(reversed(Stack([1, 2, 3])))
expected = [3, 2, 1]
self.assertEqual(expected, actual)