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Jest as Test Runner

Usage

0. Use the Getting Started Guide to set up detox

Except that you need to skip the install mocha step.

1. Install Jest

npm install --save-dev jest

2. Remove mocha specific files

You should remove e2e/mocha.opts, you no longer need it.

3. Replace generated detox setup file (e2e/init.js)

const detox = require('detox');
const config = require('../package.json').detox;

// Set the default timeout
jasmine.DEFAULT_TIMEOUT_INTERVAL = 120000;

beforeAll(async () => {
  await detox.init(config);
});

afterAll(async () => {
  await detox.cleanup();
});

beforeEach(async () => {
  await device.reloadReactNative();
});

4. Run jest

Add this part to your package.json:

"jest": {
  "setupTestFrameworkScriptFile": "./e2e/init.js"
},
"scripts": {
    "test:e2e": "detox test -c ios.sim.debug",
    "test:e2e:build": "detox build"
},
"detox": {
  "runner": "jest",
  ...
}

Writing Tests

There are some things you should notice:

  • Don't worry about mocks being used, detox works on the compiled version of your app.
  • Detox exposes it's primitives (expect, device, ...) globally, it will override Jest's global expect object.

How to run unit test and E2E tests in the same project

  • If you have a setup file for the unit tests pass ./jest/setup implementation into your unit setup.
  • Call your E2E tests like mentioned above