Add unit test for viewport simulation membership signatures

tests/unit/viewport-simulation-membership.test.ts

@@ -0,0 +1,100 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  createViewportSimulationMembershipSignatures
+} from "../../src/viewport-three/viewport-host";
+import type { RuntimeSceneDefinition } from "../../src/runtime-three/runtime-scene-build";
+
+describe("createViewportSimulationMembershipSignatures", () => {
+  it("tracks structural simulation membership without including per-frame values", () => {
+    const runtimeScene = {
+      localLights: {
+        pointLights: [
+          {
+            entityId: "point-a",
+            intensity: 1
+          }
+        ],
+        spotLights: [
+          {
+            entityId: "spot-a",
+            intensity: 2
+          }
+        ]
+      },
+      volumes: {
+        light: [
+          {
+            brushId: "volume-a",
+            lights: [{}, {}]
+          }
+        ]
+      },
+      modelInstances: [
+        {
+          instanceId: "model-a",
+          visible: true
+        }
+      ],
+      entities: {
+        interactables: [
+          {
+            entityId: "interactable-a",
+            interactionEnabled: true
+          }
+        ]
+      }
+    } as RuntimeSceneDefinition;
+
+    const changedValuesScene = {
+      ...runtimeScene,
+      localLights: {
+        pointLights: [
+          {
+            entityId: "point-a",
+            intensity: 5
+          }
+        ],
+        spotLights: [
+          {
+            entityId: "spot-a",
+            intensity: 8
+          }
+        ]
+      },
+      modelInstances: [
+        {
+          instanceId: "model-a",
+          visible: false
+        }
+      ],
+      entities: {
+        interactables: [
+          {
+            entityId: "interactable-a",
+            interactionEnabled: false
+          }
+        ]
+      }
+    } as RuntimeSceneDefinition;
+
+    const changedStructureScene = {
+      ...runtimeScene,
+      volumes: {
+        light: [
+          {
+            brushId: "volume-a",
+            lights: [{}]
+          }
+        ]
+      }
+    } as RuntimeSceneDefinition;
+
+    expect(createViewportSimulationMembershipSignatures(changedValuesScene)).toEqual(
+      createViewportSimulationMembershipSignatures(runtimeScene)
+    );
+    expect(
+      createViewportSimulationMembershipSignatures(changedStructureScene)
+    ).not.toEqual(createViewportSimulationMembershipSignatures(runtimeScene));
+  });
+});