Trying to run unit testing for a findAll() function. But getting this error " expect(received).toEqual(expected) // deep equality " - jestjs

Question

Error message is this.
` PASS src/app.controller.spec.ts
FAIL src/users/services/users.service.spec.ts
● UsersService › should return all users
expect(received).toEqual(expected) // deep equality
- Expected - 6
+ Received + 1
- Object {
- "birthDate": 2010-06-07T00:00:00.000Z,
- "email": "xs#gsuj.lk",
- "id": 2,
- "name": "aq1s",
- }
+ Object {}
66 | //const dto ={id:2, name:'aq1s',birthDate: new Date('2010-06-07'), email : "xs#gsuj.lk" };
67 |
> 68 | expect( await service.findAll()).toEqual({
| ^
69 | id:2,
70 | name:'aq1s',
71 | birthDate: new Date('2010-06-07'),
at src/users/services/users.service.spec.ts:68:38
at fulfilled (src/users/services/users.service.spec.ts:5:58)
FAIL src/users/controllers/users.controller.spec.ts (5.09 s)
● UsersController › should findall
expect(received).toEqual(expected) // deep equality
- Expected - 6
+ Received + 1
- Object {
- "birthDate": 2010-06-07T00:00:00.000Z,
- "email": "xs#gsuj.lk",
- "id": 2,
- "name": "aq1s",
- }
+ Object {}
129 | const data = await controller.findAll();
130 |
> 131 | expect(data).toEqual({
| ^
132 | id: dto.id,
133 | name: dto.name,
134 | birthDate: dto.birthDate,
at src/users/controllers/users.controller.spec.ts:131:18
at fulfilled (src/users/controllers/users.controller.spec.ts:5:58)
Test Suites: 3 failed, 1 passed, 4 total
Tests: 2 failed, 9 passed, 11 total
Snapshots: 0 total
Time: 5.85 s
Ran all test suites.`
Users.controller.spec.ts file is this
describe('UsersController', () => {
let controller: UsersController;
const mockUsersService = {
create: jest.fn((dto) => {
return {
...dto,
};
}),
update: jest.fn((id, dto) => ({
id,
...dto,
})),
delete: jest.fn((id) => ({
id,
})),
findAll: jest.fn((dto) => {
return {
...dto,
};
}),
};
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
controllers: [UsersController],
providers: [UsersService],
})
.overrideProvider(UsersService)
.useValue(mockUsersService)
.compile();
//get service module from user module
controller = module.get<UsersController>(UsersController);
});
//check if service available
it('should be defined', () => {
expect(controller).toBeDefined();
});
it('should create', async () => {
const dto = {
id: 2,
name: 'aqs',
birthDate: new Date('2000-06-07'),
email: 'xs#gsuj.lk',
};
const data = await controller.create(dto);
expect(data).toEqual({
id: dto.id,
name: dto.name,
birthDate: dto.birthDate,
email: dto.email,
});
expect(controller).toBeDefined();
});
it('should findall', async () => {
const dto = {
id: 2,
name: 'aq1s',
birthDate: new Date('2010-06-07'),
email: 'xs#gsuj.lk',
};
const data = await controller.findAll();
expect(data).toEqual({
id: dto.id,
name: dto.name,
birthDate: dto.birthDate,
email: dto.email,
}),
expect(controller).toBeDefined();
});
});
user.service.spec.ts file is this.
describe('UsersService', () => {
let service: UsersService;
// let providers:UsersController;
const mockUsersRepository ={
create:jest.fn().mockImplementation(dto =>dto),
save:jest.fn().mockImplementation(user => Promise.resolve({id:2, ...user})),
update:jest.fn().mockImplementation((id,user) => Promise.resolve({id:2, ...user})),
delete:jest.fn().mockImplementation(id => Promise.resolve({id:2})),
find:jest.fn().mockImplementation(() => ({})),
}
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
providers: [UsersService, {
provide:getRepositoryToken(User),
useValue:mockUsersRepository,
},
],
}).compile();
service = module.get<UsersService>(UsersService);
});
it('should be create a new user record and return that', async () => {
expect( await service.create({id:2, name:'aqs',birthDate: new Date('2000-06-07'), email : "xs#gsuj.lk" })).toEqual({
id:2,
name:'aqs',
birthDate: new Date('2000-06-07'),
email : "xs#gsuj.lk" ,
});
});
it('should return all users', async () => {
//const dto ={id:2, name:'aq1s',birthDate: new Date('2010-06-07'), email : "xs#gsuj.lk" };
expect( await service.findAll()).toEqual({
id:2,
name:'aq1s',
birthDate: new Date('2010-06-07'),
email : "xs#gsuj.lk" ,
});
});
});
users.controller file is this
#Get()
async findAll() {
const users = await this.userService.findAll();
if (!users) {
return 'error while finding users';
}
return users;
}
users.service file is this
findAll(): Promise<User[]> {
return this.userRepository.find()
}

Answer 1

Fixed the issue by, user.controller.spec.ts
it('should find all', async () => {
const data = await controller.findAll();
expect(data).toEqual({}),
expect(controller).toBeDefined();
});
And user.service.spec.ts:
it('should return all users', async () => {
expect( await service.findAll()).toEqual({});
});