Add test for delete selection command

tests/domain/delete-selection.command.test.ts

@@ -0,0 +1,94 @@
+import { describe, expect, it } from "vitest";
+
+import { createEditorStore } from "../../src/app/editor-store";
+import { createModelInstance } from "../../src/assets/model-instances";
+import {
+  createProjectAssetStorageKey,
+  type ModelAssetRecord
+} from "../../src/assets/project-assets";
+import { createDeleteSelectionCommand } from "../../src/commands/delete-selection-command";
+import { createEmptySceneDocument } from "../../src/document/scene-document";
+
+const modelAsset = {
+  id: "asset-model-delete",
+  kind: "model",
+  sourceName: "delete-fixture.glb",
+  mimeType: "model/gltf-binary",
+  storageKey: createProjectAssetStorageKey("asset-model-delete"),
+  byteLength: 64,
+  metadata: {
+    kind: "model",
+    format: "glb",
+    sceneName: "Delete Fixture",
+    nodeCount: 1,
+    meshCount: 1,
+    materialNames: [],
+    textureNames: [],
+    animationNames: [],
+    boundingBox: null,
+    warnings: []
+  }
+} satisfies ModelAssetRecord;
+
+describe("delete selection command", () => {
+  it("deletes same-kind selections in one undoable batch action", () => {
+    const modelInstanceA = createModelInstance({
+      id: "model-instance-delete-a",
+      assetId: modelAsset.id,
+      position: {
+        x: 0,
+        y: 0,
+        z: 0
+      }
+    });
+    const modelInstanceB = createModelInstance({
+      id: "model-instance-delete-b",
+      assetId: modelAsset.id,
+      position: {
+        x: 4,
+        y: 1,
+        z: -2
+      }
+    });
+    const store = createEditorStore({
+      initialDocument: {
+        ...createEmptySceneDocument({ name: "Delete Multi Fixture" }),
+        assets: {
+          [modelAsset.id]: modelAsset
+        },
+        modelInstances: {
+          [modelInstanceA.id]: modelInstanceA,
+          [modelInstanceB.id]: modelInstanceB
+        }
+      }
+    });
+    const selection = {
+      kind: "modelInstances" as const,
+      ids: [modelInstanceA.id, modelInstanceB.id]
+    };
+
+    store.setSelection(selection);
+    store.executeCommand(createDeleteSelectionCommand(selection));
+
+    expect(store.getState().document.modelInstances[modelInstanceA.id]).toBeUndefined();
+    expect(store.getState().document.modelInstances[modelInstanceB.id]).toBeUndefined();
+    expect(store.getState().selection).toEqual({
+      kind: "none"
+    });
+    expect(store.getState().activeSelectionId).toBeNull();
+
+    expect(store.undo()).toBe(true);
+    expect(store.getState().document.modelInstances[modelInstanceA.id]).toEqual(
+      modelInstanceA
+    );
+    expect(store.getState().document.modelInstances[modelInstanceB.id]).toEqual(
+      modelInstanceB
+    );
+    expect(store.getState().selection).toEqual(selection);
+    expect(store.getState().activeSelectionId).toBe(modelInstanceB.id);
+
+    expect(store.redo()).toBe(true);
+    expect(store.getState().document.modelInstances[modelInstanceA.id]).toBeUndefined();
+    expect(store.getState().document.modelInstances[modelInstanceB.id]).toBeUndefined();
+  });
+});