feat: récupération sommaire des groupes de tâches

src/services/group.service.spec.ts

@@ -0,0 +1,15 @@
+import { TestBed } from '@angular/core/testing';
+import { GroupService } from './group-service';
+
+describe('GroupService', () => {
+  let service: GroupService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(GroupService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});