def test_new_subset_action(self):
        layer = self.add_layer()
        self.new_action.trigger()
        assert len(self.collect.subset_groups) == 1
new action creates a new subset group
dataset/ETHPy150Open glue-viz/glue/glue/app/qt/tests/test_layer_tree_widget.py/TestLayerTree.test_new_subset_action