def test_mapping_pbc(self):
frame = Frame(self.data_dir.joinpath("pbcwater.gro"))
mapping = Mapping(self.data_dir.joinpath("water.map"), DummyOptions)
cg_frame = mapping.apply(frame)
np.testing.assert_allclose(
frame.atom(0).coords,
cg_frame.atom(0).coords)
