Expand governed Dataflow editor and node library

tests/test_node_library.py

@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+import unittest
+
+from govoplan_dataflow.backend.node_library import CATEGORY_LABELS, NODE_LIBRARY, NODE_TYPES
+
+
+class DataflowNodeLibraryTests(unittest.TestCase):
+    def test_library_has_unique_executable_nodes_in_every_category(self) -> None:
+        self.assertEqual(len(NODE_LIBRARY), len(NODE_TYPES))
+        self.assertEqual(set(CATEGORY_LABELS), {item.category for item in NODE_LIBRARY})
+        self.assertEqual(
+            {
+                "source.inline",
+                "source.reference",
+                "combine.union",
+                "combine.join",
+                "filter",
+                "distinct",
+                "select",
+                "derive",
+                "aggregate",
+                "sort",
+                "limit",
+                "output",
+            },
+            set(NODE_TYPES),
+        )
+
+    def test_join_and_union_publish_their_connection_contract(self) -> None:
+        join = NODE_TYPES["combine.join"]
+        union = NODE_TYPES["combine.union"]
+
+        self.assertEqual(["left", "right"], [port.id for port in join.input_ports])
+        self.assertTrue(union.input_ports[0].multiple)
+        self.assertEqual(2, union.input_ports[0].minimum_connections)
+        self.assertEqual([], list(NODE_TYPES["output"].output_ports))
+
+
+if __name__ == "__main__":
+    unittest.main()