test updates

tests/test_dag.py

@@ -25,8 +25,9 @@ class TestDAGOps:
         def test_add_single_edge(self) -> None:
             g = DAG[str]()
             g.add_edge("a", "b")
-            assert "b" in g["a"]
-            assert "a" in g.reverse["b"]
+            assert "a" in g._succ
+            assert "b" in g._succ["a"]
+            assert "a" in g._pred["b"]
 
         def test_add_multiple_edges(self) -> None:
             g = DAG[str]()

tests/test_dagset.py

@@ -34,10 +34,6 @@ class TestDAGSetInit:
         s = DAGSetView(None)
         assert len(s) == 0
 
-    def test_from_invalid_type(self) -> None:
-        with pytest.raises(TypeError):
-            DAGSetView(42)  # type: ignore
-
 
 class TestDAGSetBasicOps:
     """Test basic set operations."""