Debugging NestJS E2E tests can be incredibly frustrating, especially when seemingly simple issues arise due to undocumented framework behavior. I recently encountered a problem where my E2E tests consistently failed due to the @Processor decorator in NestJS. This decorator, it turns out, introduces complexities not immediately apparent in testing.
My initial attempts to resolve the test failures involved several common approaches, all unsuccessful:
-
ioredis-mockMocking: Attempting to mock the entire Redis interaction withioredis-mockfailed to resolve the underlying issue. - Testcontainers: Utilizing Testcontainers to manage a temporary Redis instance during testing also proved ineffective.
- Real Redis Instance: Even with a fully functional, running Redis instance, the tests continued to fail.
The Root Cause: @Processor and Mocking
The core problem stemmed from the use of the @Processor decorator within my src/user/audio.consumer.ts file. This decorator's behavior isn't explicitly detailed in the NestJS documentation, leading to unexpected test failures.
My initial test setup looked like this:
import { getQueueToken } from '@nestjs/bullmq';
import { INestApplication } from '@nestjs/common';
import { Test, TestingModule } from '@nestjs/testing';
import * as request from 'supertest';
import { AppModule } from '../src/app.module';
import { mockBullMqService } from './bullmq.mock';
describe('AppController (e2e)', () => {
// ... (beforeAll, afterAll omitted for brevity)
it('/ (GET)', () => {
return request(app.getHttpServer())
.get('/cart')
.expect(200)
.expect('Hi');
});
});
This failed because of the @Processor decorator. The solution required a more targeted approach to mocking:
const moduleFixture: TestingModule = await Test.createTestingModule({
imports: [AppModule],
})
.overrideProvider(getQueueToken('YOUR_QUEUE_NAME'))
.useValue({
on: jest.fn(),
add: jest.fn(),
process: jest.fn(),
})
.overrideProvider(AudioConsumer) // Crucial addition
.useValue({}) // Provide an empty value
.compile();
By explicitly overriding the AudioConsumer provider with an empty object, I bypassed the @Processor decorator's implicit behavior and resolved the test failures.
Remaining Challenges: Testcontainers and Real Redis
While the @Processor issue is resolved, I haven't yet fully addressed the problems encountered with Testcontainers and a real Redis instance. Further investigation is needed to determine the root cause of those specific failures.
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