Tests: Mock date for snapshot

Author: manosim

src/js/components/__snapshots__/notification.test.tsx.snap

@@ -50,7 +50,7 @@ exports[`components/notification.js should render itself & its children 1`] = `
       </span>
        - Updated
        
-      over 2 years ago
+      in over 3 years
     </div>
   </div>
   <div

src/js/components/notification.test.tsx

@@ -28,6 +28,8 @@ describe('components/notification.js', () => {
   });
 
   it('should render itself & its children', async () => {
+    (global as any).Date.now = jest.fn(() => new Date('2014'));
+
     const props = {
       markNotification: jest.fn(),
       markOnClick: false,