def METHOD_NAME(manager):
    manager.test_window("one")
    two = manager.test_window("two")
    assert manager.c.layout.info()["clients"] == ["one", "two"]
    assert_z_stack(manager, ["one", "two"])
    manager.kill_window(two)
    assert manager.c.layout.info()["clients"] == ["one"]
    assert_z_stack(manager, ["one"])