def test_pop():
state = State(stack=[1, 2])
state.pop()
assert state.stack == [1]
def test_pop_empty_stack():
state = State()
with pytest.raises(exc.StackError):
state.pop()
def test_pop():
state = State(stack=[1, 2])
state.pop()
assert state.stack == [1]
def test_pop_empty_stack():
state = State()
with pytest.raises(exc.StackError):
state.pop()