def METHOD_NAME(backend_class):
    # Arrange
    settings = DisplacementSettings()
    sut, particulator = settings.get_displacement(
        backend_class, scheme="ImplicitInSpace"
    )
    droplet_id = 0
    state = particulator.attributes
    state["cell origin"][:] = particulator.backend.Storage.from_ndarray(
        np.asarray([[1], [1]])
    )
    # Act
    sut.boundary_condition(state["cell origin"])
    # Assert
    assert state["cell origin"][0, droplet_id] == 0
    assert state["cell origin"][1, droplet_id] == 0