def METHOD_NAME(self, ethane):
    ethane.translate_to(np.ones(3))
    separation = [1, 2, 3]
    port = mb.Port(anchor=ethane, separation=separation)
    assert [
        ethane.center[i] + separation[i] == coord
        for i, (coord, sep) in enumerate(zip(port.center, separation))
    ]