访问 Apollo 服务器以进行 NestJS GraphQL 测试答案

【问题标题】：Access to Apollo server for NestJS GraphQL test访问 Apollo 服务器以进行 NestJS GraphQL 测试
【发布时间】：2019-09-24 03:27:30
【问题描述】：

测试 Apollo GraphQL 服务器的标准方法是使用Apollo test client。 createTestClient 方法需要 server 参数。在 NestJS/TypeGraphQL 应用程序中，从 (Jest) 测试内部访问由 GraphQLModule 创建的 Apollo 服务器的适当方法是什么？

【问题讨论】：

标签： graphql apollo nestjs

【解决方案1】：

    const moduleFixture = await Test.createTestingModule({
      imports: [ApplicationModule],
    }).compile()
    const app = await moduleFixture.createNestApplication(new ExpressAdapter(express)).init()
    const module: GraphQLModule = moduleFixture.get<GraphQLModule>(GraphQLModule)
    const apolloClient = createTestClient((module as any).apolloServer)

这就是我的工作

【讨论】：

在我的项目中，这会导致 TypeError: Cannot read property 'executeOperation' of undefined，因为 module.apolloServer 未定义。 NestFactory.createApplicationContext(AppModule) 也是如此。使用"@nestjs/graphql": "^6.5.1"

【解决方案2】：

此 PR https://github.com/nestjs/graphql/pull/1104 使您能够使用 apollo-server-testing 编写测试。

【讨论】：

【解决方案3】：

这段代码对我有用。感谢 JustMe

import { Test, TestingModule } from '@nestjs/testing';
import { INestApplication } from '@nestjs/common';
import { createTestClient, TestQuery } from 'apollo-server-integration-testing';

import { AppModule } from './../src/app.module';
import { GraphQLModule } from '@nestjs/graphql';

describe('AppController (e2e)', () => {
  let app: INestApplication;
  // let mutateTest: TestQuery;
  let correctQueryTest: TestQuery;
  let wrongQueryTest: TestQuery;

  beforeEach(async () => {
    const moduleFixture: TestingModule = await Test.createTestingModule({
      imports: [AppModule],
    }).compile();

    app = moduleFixture.createNestApplication();
    await app.init();
    const module: GraphQLModule =
      moduleFixture.get<GraphQLModule>(GraphQLModule);
    const { query: correctQuery } = createTestClient({
      apolloServer: (module as any).apolloServer,
      extendMockRequest: {
        headers: {
          token:
            'iIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI2MWFiNmY0MjQ3YjEyYWNiNzQyYmQwYmYiLCJyb2xlIjoibWFuYWdlciIsImVtYWlsIjoibGVuYUBtYWlsLmNvbSIsInBhc3N3b3JkIjoiZTEwYWRjMzk0OWJhNTlhYmJlNTZlMDU3ZjIwZjg4M2UiLCJ1c2VybmFtZSI6ImxlbmEgZG9lIiwiY3JlYXRlZEF0IjoiMjAyMS0xMi0wNFQxMzozODoxMC4xMzZaIiwidXBkYXRlZEF0IjoiMjAyMS0xMi0wNFQxMzozODoxMC4xMzZaIiwiX192IjowLCJpYXQiOjE2Mzg2NTE4MjMsImV4cCI6MTYzODY1MTg4M30.d6SCh4x6Wwpj16UWf4ca-PbFCo1FQm_bLelp8kscG8U',
        },
      },
    });
    const { query: wrongQuery } = createTestClient({
      apolloServer: (module as any).apolloServer,
    });
    // mutateTest = mutate;
    correctQueryTest = correctQuery;
    wrongQueryTest = wrongQuery;
  });

  it('/ Correct', async () => {
    const result = await correctQueryTest(`
        query FILTER_JOBS{
          filterJobs(status: DONE) {
            title,
            status,
            description,
            lat,
            long,
            employees,
            images,
            assignedBy {
              username,
              email
            }
          }
        }
    `);
    console.log(result);
  });
  it('/ Wrong', async () => {
    const result = await wrongQueryTest(`
        query FILTER_JOBS{
          filterJobs(status: DONE) {
            title,
            status,
            description,
            lat,
            long,
            employees,
            images,
            assignedBy {
              username,
              email
            }
          }
        }
    `);
    console.log(result);
  });
});

【讨论】：