test(local-storage): extract shared global mock

tests/LocalStorage/LocalStoragePrimitive.test.ts

@@ -1,47 +1,22 @@
 import { render } from "@testing-library/svelte";
+import { setupLocalStorageMock } from "../setup-tests";
 import LocalStoragePrimitive from "./LocalStoragePrimitive.test.svelte";
 
 describe("LocalStorage - Primitive Values", () => {
-  let localStorageMock: { [key: string]: string };
-  let originalLocalStorage: Storage;
-  let consoleSpy: any;
+  const { setMockItem } = setupLocalStorageMock();
+  let consoleLog: ReturnType<typeof vi.spyOn>;
 
   beforeEach(() => {
-    originalLocalStorage = global.localStorage;
-    localStorageMock = {};
-    consoleSpy = vi.spyOn(console, "log");
-
-    global.localStorage = {
-      getItem: vi.fn((key) => localStorageMock[key] || null),
-      setItem: vi.fn((key, value) => {
-        localStorageMock[key] = value;
-      }),
-      removeItem: vi.fn((key) => {
-        delete localStorageMock[key];
-      }),
-      clear: vi.fn(() => {
-        localStorageMock = {};
-      }),
-      length: 0,
-      key: vi.fn(),
-    };
-  });
-
-  afterEach(() => {
-    global.localStorage = originalLocalStorage;
-    localStorage.clear();
-    vi.restoreAllMocks();
-    localStorageMock = {};
+    consoleLog = vi.spyOn(console, "log");
   });
 
   it("saves primitive value to localStorage on mount", () => {
     render(LocalStoragePrimitive);
-
     expect(localStorage.setItem).toHaveBeenCalledWith("test-key", "test-value");
   });
 
   it("loads existing primitive value from localStorage", () => {
-    localStorageMock["test-key"] = "existing-value";
+    setMockItem("test-key", "existing-value");
 
     render(LocalStoragePrimitive);
     expect(localStorage.getItem).toHaveBeenCalledWith("test-key");
@@ -49,11 +24,11 @@ describe("LocalStorage - Primitive Values", () => {
 
   it("dispatches save event when setting initial value", () => {
     render(LocalStoragePrimitive);
-    expect(consoleSpy).toHaveBeenCalledWith("save event");
+    expect(consoleLog).toHaveBeenCalledWith("save event");
   });
 
   it("handles invalid values gracefully", () => {
-    localStorageMock["test-key"] = "{invalid-value}";
+    setMockItem("test-key", "{invalid-value}");
 
     render(LocalStoragePrimitive);
     expect(localStorage.getItem).toHaveBeenCalledWith("test-key");