8.3Test 1: All Subgraph Types Are Resolvable

class TestSchemaFederation:
    """Test that federated GraphQL schemas compose correctly."""

    def test_all_subgraph_types_resolvable(self, composed_schema, subgraphs):
        """Every type defined in a subgraph should be resolvable
        in the composed schema."""
        for subgraph_name, subgraph_schema in subgraphs.items():
            for type_name in subgraph_schema.get_types():
                if type_name.startswith("__"):  # Skip introspection types
                    continue
                assert type_name in composed_schema.get_types(), (
                    f"Type '{type_name}' from subgraph '{subgraph_name}' "
                    f"is not resolvable in the composed schema"
                )