def METHOD_NAME(manager):
    manager.test_window("one")
    assert manager.c.layout.info()["rows"] == [["one"]]
    manager.test_window("two")
    assert manager.c.layout.info()["rows"] == [["one", "two"]]
    manager.test_window("three")
    assert manager.c.layout.info()["rows"] == [["one", "two"], ["three"]]