How to test nestjs with graphql by end to end? - graphql

Question

In the test/posts/posts.e2e-spec.ts file
import { INestApplication } from '#nestjs/common';
import { TypeOrmModule } from '#nestjs/typeorm';
import { Test, TestingModule } from '#nestjs/testing';
import request = require('supertest');
import { PostsModule } from '../../src/posts/posts.module';
describe('Posts (e2e)', () => {
const posts = {
id: 1,
name: 'FirstPost #1',
};
let app: INestApplication;
beforeAll(async () => {
const moduleFixture: TestingModule = await Test.createTestingModule({
imports: [
TypeOrmModule.forRoot({
type: 'mysql',
...
}),
PostModule,
],
}).compile();
app = moduleFixture.createNestApplication();
await app.init();
});
afterAll(async () => {
await app.close();
});
describe('post', () => {
it('should retrieve all post data', async () => {
request(app.getHttpServer())
.post('/graphql')
.send({
query:
`{findPosts() {
name
}}`,
})
.expect(200)
.expect((res) => {
console.log(res.body.data)
expect(res.body.data.post.length).toEqual(posts.length)
})
})
})
});
I created migration and inserted data into database first, then run this test, it can't go to the expect items. Even set console log I can't see anything in the output.
So maybe the /graphql can't be access in this way? I can access the endpoint from browser as http://localhost:3000/graphql.
If import supertest as
import * as request from 'supertest';
In the line request it showed:
This expression is not callable. Type ‘typeof supertest’ has no call signatures.
The version of them:
supertest: 6.1.3
#types/supertest: 2.0.11

Answer 1

Check out this very useful link https://github.com/jmcdo29/testing-nestjs/tree/main/apps/graphql-sample. It explains a lot of things regarding tests including graphql nestjs testing along with sample application