code: def test_compose(self):
      composed = compose_types(C, D)
  
      assert_is_subclass(composed, C)
      assert_is_subclass(composed, D)
  
imports: from catalyst.testing.fixtures import CatalystTestCase
  from catalyst.testing.predicates import assert_equal, assert_is, assert_is_instance, assert_is_subclass, assert_true
  from catalyst.utils.metautils import compose_types, with_metaclasses
label_desc: Use image node_id 2 for calling the ComposeTypesTestCase obj's underlying member method code with example usage: obj.test_compose() without return types