refactor: mock SeedService in SeedController tests

Author: tomast1337

server/src/seed/seed.controller.spec.ts

@@ -9,7 +9,12 @@ describe('SeedController', () => {
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
       controllers: [SeedController],
-      providers: [SeedService],
+      providers: [
+        {
+          provide: SeedService,
+          useValue: {},
+        },
+      ],
     }).compile();
 
     controller = module.get<SeedController>(SeedController);