def METHOD_NAME(self):
    ensemble = PDBENSEMBLEA[:]
    n_conf = ensemble.numCoordsets()
    n_csets = ATOMS.numCoordsets()
    ensemble.addCoordset(ATOMS)
    assert_equal(ensemble.numCoordsets(), n_conf+n_csets,
                 'adding coordsets failed')
    ensemble.addCoordset(ATOMS, degeneracy=True)
    assert_equal(ensemble.numCoordsets(), n_conf+n_csets+1,
                 'adding coordsets failed')