DAG test org

tests/test_dag.py

@@ -18,6 +18,7 @@ class TestDAGInit:
         assert g.on_remove is None
 
 
+class TestDAGOps:
     class TestDAGAddEdge:
         """Test adding edges."""
 
@@ -53,7 +54,6 @@ class TestDAGAddEdge:
             g.add_edge("a", "b")
             assert len(g["a"]) == 1
 
-
     class TestDAGRemoveEdge:
         """Test removing edges."""
 
@@ -73,7 +73,6 @@ class TestDAGRemoveEdge:
             with pytest.raises(KeyError):
                 g.remove_edge("a", "b", missing_ok=False)
 
-
     class TestDAGDiscardNode:
         """Test node removal."""
 
@@ -100,7 +99,39 @@ class TestDAGDiscardNode:
             g.discard_node("z")  # should not raise
 
 
-class TestDAGGetItem:
+class TestDAGBasicOps:
+    class TestSetItem:
+        """Test dictionary-style assignment."""
+
+        def test_with_set(self) -> None:
+            g = DAG[str]()
+            g["a"] = {"b", "c"}
+            assert "b" in g["a"]
+            assert "c" in g["a"]
+
+        def test_with_list(self) -> None:
+            g = DAG[str]()
+            g["a"] = ["b", "c"]
+            assert "b" in g["a"]
+            assert "c" in g["a"]
+
+        def test_with_string(self) -> None:
+            g = DAG[str]()
+            g["a"] = "b"
+            assert "b" in g["a"]
+
+        def test_with_single_item(self) -> None:
+            g = DAG[int]()
+            g[1] = 2
+            assert 2 in g[1]
+
+        def test_updates_reverse(self) -> None:
+            g = DAG[str]()
+            g["a"] = {"b", "c"}
+            assert "a" in g.reverse["b"]
+            assert "a" in g.reverse["c"]
+
+    class TestGetItem:
         """Test dictionary-style access."""
 
         def test_getitem_returns_dagset(self) -> None:
@@ -127,66 +158,31 @@ class TestDAGGetItem:
             g["a"].add("b")
             assert ("a", "b") in added
 
-
-class TestDAGSetItem:
-    """Test dictionary-style assignment."""
-
-    def test_setitem_with_set(self) -> None:
-        g = DAG[str]()
-        g["a"] = {"b", "c"}
-        assert "b" in g["a"]
-        assert "c" in g["a"]
-
-    def test_setitem_with_list(self) -> None:
-        g = DAG[str]()
-        g["a"] = ["b", "c"]
-        assert "b" in g["a"]
-        assert "c" in g["a"]
-
-    def test_setitem_with_string(self) -> None:
-        g = DAG[str]()
-        g["a"] = "b"
-        assert "b" in g["a"]
-
-    def test_setitem_with_single_item(self) -> None:
-        g = DAG[int]()
-        g[1] = 2
-        assert 2 in g[1]
-
-    def test_setitem_updates_reverse(self) -> None:
-        g = DAG[str]()
-        g["a"] = {"b", "c"}
-        assert "a" in g.reverse["b"]
-        assert "a" in g.reverse["c"]
-
-
     class TestDAGDelItem:
         """Test del operation."""
 
-    def test_delitem_removes_node(self) -> None:
+        def test_removes_node(self) -> None:
             g = DAG[str]()
             g.add_edge("a", "b")
             del g["a"]
             assert "a" not in g._succ
 
 
-class TestDAGIter:
+class TestDAGIterOps:
+    class TestIter:
         """Test iteration."""
 
-    def test_iter_empty(self) -> None:
+        def test_empty(self) -> None:
             g = DAG[str]()
             assert list(g) == []
 
-    def test_iter_returns_nodes(self) -> None:
+        def test_returns_nodes(self) -> None:
             g = DAG[str]()
             g.add_edge("a", "b")
             g.add_edge("b", "c")
-        nodes = set(g)
-        assert "a" in nodes
-        assert "b" in nodes
+            assert {"a", "b"} == set(g)
 
-
-class TestDAGLen:
+    class TestLen:
         """Test length (edge count)."""
 
         def test_len_empty(self) -> None:
@@ -252,24 +248,6 @@ class TestDAGCallbacks:
         assert ("a", "b") in removed
 
 
-class TestDAGRepr:
-    """Test string representation."""
-
-    def test_repr_empty(self) -> None:
-        g = DAG[str]()
-        r = repr(g)
-        assert "DAG" in r
-        assert "{}" in r
-
-    def test_repr_with_edges(self) -> None:
-        g = DAG[str]()
-        g.add_edge("a", "b")
-        r = repr(g)
-        assert "DAG" in r
-        assert "a" in r
-        assert "b" in r
-
-
 class TestDAGComplexScenarios:
     """Test complex usage patterns."""