Usage with jest globalSetup and globalTeardown

Awesome module!

We’re running fine with the current implementation, however, one small sticking point is that we have to perform a new connection and disconnection within every jest block. It would be awesome if we were able to use a globalSetup and globalTeardown to connect/disconnect our client (mongoose) to the database once.

Unfortunately, when I do this, the process.env.MONGO_URL is undefined:

module.exports = async function globalSetup() {
  await mongoose.connect(process.env.MONGO_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: false,
  });
};

I suspect this is because the setup and teardown might run before the preset? Any thoughts as to a way around this limitation?

[chanced]

Yea. You should be able to, I believe. mongoSetup is just the variable name I assigned to require'@shelf/jest-mongodb/setup') which is the default export of https://github.com/shelfio/jest-mongodb/blob/master/setup.js#L10

Given your initial function, it would look like:

const mongoSetup = require('@shelf/jest-mongodb/setup'); 

module.exports = async function globalSetup() {
  await mongoSetup();
  // process.env.MONGO_URL is now set by
  // https://github.com/shelfio/jest-mongodb/blob/fcda766bfa433644a7383993467ccaa06dfea28b/setup.js#L26
  await mongoose.connect(process.env.MONGO_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: false,
  });
};

[RashiqAzhan]

I did as follows, but I am having trouble connecting to the database from my test files.

Here are the relevant files with their code. jest.setup.js

import mongoose from "mongoose";

const mongoSetup = require("@shelf/jest-mongodb/setup");

module.exports = async () => {
  await mongoSetup();

  global.__DB__await = mongoose
    .connect(process.env.MONGO_URL, {
      useNewUrlParser: true,
      useCreateIndex: true,
      useUnifiedTopology: true,
      useFindAndModify: false,
    })
    .then(null, (err) => {
      console.log(
        `In-memory mongodb instance failed to initialize. Error: ${err}`
      );
    });
};

jest.teadown.js

import mongoose from "mongoose";

module.exports = async () => {
  await mongoose.connection.close();
};

jest.config.js

module.exports = {
 preset: "@shelf/jest-mongodb",
 globalSetup: "<rootDir>/server/__tests__/__utils__/jest.setup.js",
 globalTeardown: "<rootDir>/server/__tests__/__utils__/jest.teardown.js",
}

None of my tests that require a connection to mongodb to run successfully and pass. Running npm run test -- --detectOpenHandles reveals the following errors.

●  TCPSERVERWRAP

710 |       };
711 |       let response = await request(app)
> 712 |         .post("/api/users")
|          ^
713 |         .send(payload)
714 |         .set("Accept", "application/json");
715 |       expect(response.statusCode).toBe(200);

at Test.serverAddress (node_modules/supertest/lib/test.js:48:35)
at new Test (node_modules/supertest/lib/test.js:34:14)
at Object.post (node_modules/supertest/index.js:28:14)
at server/__tests__/controllers/user.controller.test.js:712:10

All tests exit with TCPSERVERWRAP. npm run test is test: "jest" in the package.json file.

I have tried the block of async code in the jest.setup.js and jest.teadown.js files in a beforeAll() and afterAll() embedded into each the test files and it works. All tests pass when the db connection originates from the test files themselves.

Any guidance is highly appreciated.