I've created a test for my Nest.js project. Can someone please review and confirm if this test is correct?
This test is focused on the nest service file. Here is the code:
tasks.service.ts
async getTaskById(id: string): Promise<Task> {
const found = await this.taskModel.findById(id);
if (!found) {
throw new NotFoundException(`Task not found`);
}
return found;
}
tasks.service.spec.ts
const mockTask = () => {
return {
_id: '613e4135ea46be481c2d88b2',
name: 'Task 1',
description: 'Go to school',
};
};
const tasksServiceMock: Partial<TasksService> = {
getTaskById: jest.fn().mockResolvedValue(mockTask()),
};
describe('TasksService', () => {
let service: TasksService;
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
providers: [
TasksService,
{
provide: TasksService,
useValue: tasksServiceMock,
},
],
}).compile();
service = module.get<TasksService>(TasksService);
});
it('should be defined', () => {
expect(service).toBeDefined();
});
describe('getTaskById', () => {
it('should retrieve task by ID', async () => {
const task = await service.getTaskById(mockTask()._id);
expect(task).toEqual(mockTask());
});
it('should throw Task Not Found error', async () => {
tasksServiceMock.getTaskById = jest
.fn()
.mockRejectedValue(new NotFoundException('Task not found'));
expect.assertions(2);
try {
await service.getTaskById('123456');
} catch (e) {
expect(e).toBeInstanceOf(NotFoundException);
expect(e.message).toBe('Task not found');
}
});
});
});