def METHOD_NAME(exemplar_spatial_unit_param):
    """
    Check that valid geojson is returned for Flows.
    """
    if not exemplar_spatial_unit_param.has_geography:
        pytest.skip("Query with spatial_unit=CellSpatialUnit() has no geometry.")
    dl = daily_location("2016-01-01", spatial_unit=exemplar_spatial_unit_param)
    dl2 = daily_location("2016-01-02", spatial_unit=exemplar_spatial_unit_param)
    fl = Flows(dl, dl2)
    assert geojson.loads(fl.to_geojson_string()).is_valid