implement tests

ui/src/app/app.spec.ts

@@ -1,24 +1,20 @@
 import { TestBed } from '@angular/core/testing';
 import { App } from './app';
 
-vi.hoisted(() => {
-  Object.defineProperty(window, "matchMedia", {
-    writable: true,
-    enumerable: true,
-    value: vi.fn().mockImplementation((query) => ({
-      matches: false,
-      media: query,
-      onchange: null,
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-      dispatchEvent: vi.fn(),
- })),
- });
-});
-
-
 describe('App', () => {
   beforeEach(async () => {
+    Object.defineProperty(window, 'matchMedia', {
+      writable: true,
+      enumerable: true,
+      value: vi.fn().mockImplementation((query: string) => ({
+        matches: false,
+        media: query,
+        onchange: null,
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        dispatchEvent: vi.fn(),
+      })),
+    });
     await TestBed.configureTestingModule({
       imports: [App],
     }).compileComponents();
@@ -29,5 +25,4 @@ describe('App', () => {
     const app = fixture.componentInstance;
     expect(app).toBeTruthy();
   });
-
 });