使用 SuperTest 和 Jest 测试 TypeScript Apollo 服务器：'request.post' 不是 function

Question

I'm trying to use SuperTest to test an Apollo Server following the first answer to this Stack Overflow question , among other examples I've found.

My code in its entirety is

//     /__test__/index.test.ts

import * as request from 'supertest';

    let postData = {
        query: `query allArticles{
                    allArticles{
                        id
                    }
                }`,
        operationName: 'allArticles'
    };

    test('basic', async () => {
        try {
            const response = request
                .post('/graphql')
                .send(postData)
                .expect(200); // status code that you expect to be returned
            console.log('response', response);
        } catch (error) {
            console.log(`error ${error.toString()}`);
        }
    });

However when I run this with Jest

"test": "jest --detectOpenHandles --colors"

I get

 PASS  __test__/index.test.ts
  ● Console

    console.log
    error TypeError: request.post is not a function

      at __test__/index.test.ts:20:11

For what it's worth, I don't think it's "passing" the test, as it doesn't matter what I put in the expect .

If I change my code to follow the Stack Overflow exactly (passing the GraphQL endpoint directly to request

  test('basic', async () => {
            try {
                const response = request('/graphql')
                    .post('/graphql')
                    .send(postData)
                    .expect(200); // status code that you expect to be returned
                console.log('response', response);
            } catch (error) {
                console.log(`error ${error.toString()}`);
            }
        });

I get

PASS  __test__/index.test.ts
  ● Console

    console.log
      error TypeError: request is not a function

      at __test__/index.test.ts:20:11

I'm using ts-jest , and running under Node 12.14

My tsconfig.json is

{
  "compilerOptions": {
    "target": "ES6",
    "lib": [
      "esnext",
      "dom"
    ],
    "skipLibCheck": true,
    "outDir": "dist",
    "strict": false,
    "forceConsistentCasingInFileNames": true,
    "esModuleInterop": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "sourceMap": true,
    "alwaysStrict": true
  },
  "exclude": [
    "node_modules",
    "**/*.test.ts",
    "**/*.mock.ts"
  ]
}

and my jest.config is

module.exports = {
    preset: 'ts-jest',
    testEnvironment: 'node'
};

Any clues appreciated!

Answer 1

supertest has no export, which is why need to change your import to

import {default as request} from 'supertest';

request is now the exported factory function which you can invoke:

const response = request('/graphql')
                    .post('/graphql')
...