Run Jest test suites in groups

Question

I am writing extensive tests for a new API via Jest and supertest. Prior to running the tests, I am setting up a test database and populating it with users:

Test com

Answer 1

I have done it with the --testNamePattern flag. Here is the procedure.

Let’s say that you have two groups of tests:

• DevTest for testing in development environment
• ProdTest for testing in production environemnt

If you want to test only those features required for the development environment, you have to add DevTest to the test description:

describe('(DevTest): Test in development environment', () => {
  // Your test
})

describe('(ProdTest): Test in production environment', () => {
  // Your test
})

describe('Test everywhere', () => {
  // Your test
})

After that, you can add commands to your package.json file:

  "scripts": {
    "test": "jest",
    "test:prod": "jest --testNamePattern=ProdTest",
    "test:dev": "jest --testNamePattern=DevTest",
    "test:update": "jest --updateSnapshot"
  }

Command npm test will run all of your tests, since you are not using flag --testNamePattern. If you want to run other tests, just use npm run test:dev for example.

Be careful when naming your test groups though. They are searched with regex in test description and you don't want this command to match other words.