Add tests for error handling in storage operations

tests/domain/editor-store.test.ts

@@ -21,6 +21,18 @@ class MemoryStorage implements KeyValueStorage {
   }
 }
 
+class ThrowingStorage implements KeyValueStorage {
+  getItem(_key: string): string | null {
+    throw new Error("blocked read");
+  }
+
+  setItem(_key: string, _value: string): void {
+    throw new Error("blocked write");
+  }
+
+  removeItem(_key: string): void {}
+}
+
 describe("EditorStore", () => {
   it("returns a stable snapshot between store updates", () => {
     const store = createEditorStore();
@@ -58,14 +70,34 @@ describe("EditorStore", () => {
     const writerStore = createEditorStore({ storage });
 
     writerStore.executeCommand(createSetSceneNameCommand("Draft Scene"));
-    expect(writerStore.saveDraft()).toBe(true);
+    expect(writerStore.saveDraft()).toEqual({
+      status: "saved",
+      message: "Local draft saved."
+    });
 
     const readerStore = createEditorStore({
       initialDocument: createEmptySceneDocument({ name: "Fresh Scene" }),
       storage
     });
 
-    expect(readerStore.loadDraft()).toBe(true);
+    expect(readerStore.loadDraft()).toMatchObject({
+      status: "loaded",
+      message: "Local draft loaded."
+    });
     expect(readerStore.getState().document.name).toBe("Draft Scene");
   });
+
+  it("fails gracefully when storage access throws", () => {
+    const store = createEditorStore({ storage: new ThrowingStorage() });
+
+    expect(store.saveDraft()).toMatchObject({
+      status: "error",
+      message: expect.stringContaining("blocked write")
+    });
+
+    expect(store.loadDraft()).toMatchObject({
+      status: "error",
+      message: expect.stringContaining("blocked read")
+    });
+  });
 });

tests/serialization/local-draft-storage.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, it, vi } from "vitest";
+import { describe, expect, it } from "vitest";
 
 import { SCENE_DOCUMENT_VERSION, createEmptySceneDocument } from "../../src/document/scene-document";
 import {
@@ -35,7 +35,7 @@ class ThrowingStorage implements KeyValueStorage {
     } = {}
   ) {}
 
-  getItem(): string | null {
+  getItem(_key: string): string | null {
     if (this.options.onGetItem !== undefined) {
       throw this.options.onGetItem;
     }
@@ -43,13 +43,13 @@ class ThrowingStorage implements KeyValueStorage {
     return null;
   }
 
-  setItem(): void {
+  setItem(_key: string, _value: string): void {
     if (this.options.onSetItem !== undefined) {
       throw this.options.onSetItem;
     }
   }
 
-  removeItem(): void {
+  removeItem(_key: string): void {
     if (this.options.onRemoveItem !== undefined) {
       throw this.options.onRemoveItem;
     }
@@ -88,6 +88,8 @@ describe("local draft storage", () => {
     } finally {
       if (originalDescriptor !== undefined) {
         Object.defineProperty(window, "localStorage", originalDescriptor);
+      } else {
+        Reflect.deleteProperty(window, "localStorage");
       }
     }
   });