def test_current():
stack = Stack()
assert_true(stack.current is _undefined)
stack.push('foo')
assert_equal(stack.current, 'foo')
stack.pop()
assert_true(stack.current is _undefined)
stack.push('foo, part 2')
stack.flush()
assert_true(stack.current is _undefined)
stack = Stack(['foo', 'bar', 'baz'])
assert_equal(stack.current, 'baz')
def test_current():
stack = Stack()
assert_true(stack.current is _undefined)
stack.push('foo')
assert_equal(stack.current, 'foo')
stack.pop()
assert_true(stack.current is _undefined)
stack.push('foo, part 2')
stack.flush()
assert_true(stack.current is _undefined)
stack = Stack(['foo', 'bar', 'baz'])
assert_equal(stack.current, 'baz')
def test_pop():
stack = Stack(['foo'])
assert_equal(stack.current, 'foo')
assert_equal(stack.pop(), 'foo')
assert_equal(stack.current, _undefined)
assert_raises(StackEmpty, stack.pop)
def test_pop():
stack = Stack(['foo'])
assert_equal(stack.current, 'foo')
assert_equal(stack.pop(), 'foo')
assert_equal(stack.current, _undefined)
assert_raises(StackEmpty, stack.pop)
