improve back and frontend testing

tests/node_tests/node_info.py

@@ -0,0 +1,32 @@
+"""
+Calls get_node_info() for every registered node to ensure INPUT_TYPES()
+is exercised and the registry metadata is well-formed.
+"""
+import backend.nodes  # noqa: F401 — registers all nodes
+from backend.node_registry import get_node_info, NODE_CLASS_MAPPINGS
+
+
+_REQUIRED_KEYS = {"name", "display_name", "category", "input", "output", "output_name", "description"}
+
+
+def test_all_nodes_have_valid_info():
+    for class_name in NODE_CLASS_MAPPINGS:
+        info = get_node_info(class_name)
+        missing = _REQUIRED_KEYS - info.keys()
+        assert not missing, f"{class_name} info missing keys: {missing}"
+        assert isinstance(info["input"], dict), f"{class_name} input must be a dict"
+        assert isinstance(info["output"], list), f"{class_name} output must be a list"
+        assert isinstance(info["output_name"], list), f"{class_name} output_name must be a list"
+        assert len(info["output"]) == len(info["output_name"]), (
+            f"{class_name} output/output_name length mismatch"
+        )
+
+
+def test_all_nodes_input_types_callable():
+    """INPUT_TYPES() must return a dict with at least a 'required' or 'optional' key."""
+    for class_name, cls in NODE_CLASS_MAPPINGS.items():
+        result = cls.INPUT_TYPES()
+        assert isinstance(result, dict), f"{class_name}.INPUT_TYPES() must return a dict"
+        assert "required" in result or "optional" in result, (
+            f"{class_name}.INPUT_TYPES() must have 'required' or 'optional'"
+        )