Add jest tests for twenty-front (#2983)

* Add jest tests for twenty-front

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

* Fix tests

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>
Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/modules/activities/timeline/utils/__tests__/groupActivitiesByMonth.test.ts

@@ -0,0 +1,22 @@
+import { ActivityForDrawer } from '@/activities/types/ActivityForDrawer';
+import { mockedActivities } from '~/testing/mock-data/activities';
+
+import { groupActivitiesByMonth } from '../groupActivitiesByMonth';
+
+describe('groupActivitiesByMonth', () => {
+  it('should group activities by month', () => {
+    const grouped = groupActivitiesByMonth(
+      mockedActivities as unknown as ActivityForDrawer[],
+    );
+
+    expect(grouped).toHaveLength(2);
+    expect(grouped[0].items).toHaveLength(1);
+    expect(grouped[1].items).toHaveLength(1);
+
+    expect(grouped[0].year).toBe(2023);
+    expect(grouped[1].year).toBe(2023);
+
+    expect(grouped[0].month).toBe(11);
+    expect(grouped[1].month).toBe(3);
+  });
+});