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Guide.Migration
Migration Guide

We are improving detox API as we go along, sometimes these changes require us to break the API in order for it to make more sense and. These migration guides refer to breaking changes.

Migrating from detox 4.x.x to 5.x.x

The clearest example for for the 4->5 API changes is the change log of detox's own test suite. Check detox test change log for a real life example.

###Version 5.x.x breaks detox's API in 4 different places

1. Promise based flow

All of the API calls are now promise based, and must use either promise chains or async-await.

Here's an example of async call to tap an element

// <=4.x.x
beforeEach(() => {
  element(by.text('Sanity')).tap();
});		    
// 5.x.x
beforeEach(async () => {
  await element(by.text('Sanity')).tap();
});

Same thing with expectations

// <=4.x.x
it('should have welcome screen', () => {
  expect(element(by.text('Welcome'))).toBeVisible();
  expect(element(by.text('Say Hello'))).toBeVisible(); 
  expect(element(by.text('Say World'))).toBeVisible();
};
// 5.x.x
it('should have welcome screen', async () => {
  await expect(element(by.text('Welcome'))).toBeVisible();
  await expect(element(by.text('Say Hello'))).toBeVisible();
  await expect(element(by.text('Say World'))).toBeVisible();
});

2. detox object has a leaner API

Configure and init detox with just one promise based function.

// <=4.x.x
detox.config(config);
detox.start(done);
// 5.x.x
await detox.init(config);

No need to wait for test result after each test, you can safely remove detox.waitForTestResult

// <=4.x.x
afterEach((done) => {
  detox.waitForTestResult(done);
});

cleanup is promise based

// <=4.x.x
detox.cleanup(done);
// 5.x.x
await detox.cleanup();

3. simulator is now device

The global object simulator is now device, this change makes sense when thinking about multi-platform tests (Android support). Along with the new promise based API, this is how we now control the attached device

<=4.x.x 5.x.x
simulator.reloadReactNativeApp(done) await device.reloadReactNative()
simulator.relaunchApp(done) await device.relaunchApp()
simulator.sendUserNotification(params, done) await device.sendUserNotification(params)
simulator.openURL(url) await device.openURL(url)

4. Detox config scheme

In order for our API to support multiple platforms and devices, and to be able to provide a valid command line tool, we changed the the detox configuration scheme (in package.json)

Previous config looked like this:

//<=4.x.x
  "detox": {
    "session": {
      "server": "ws://localhost:8099",
      "sessionId": "test"
    },
    "ios-simulator": {
        "app": "ios/build/Build/Products/Release-iphonesimulator/example.app",
        "device": "iPhone 7 Plus"
    }
  }

The new configuration holds a dictionary of configurations.

  1. Each configuration must state type - currently only simulator is supported
  2. app is now binaryPath
  3. build - [optional] build command (either xcodebuild, react-native run-ios, etc...), will be later available through detox CLI tool.
  4. session object is not mandatory anymore, if is not provided detox will handle server creation by itself.
//5.x.x
  "detox": {
    "configurations": {
      "ios.sim.release": {
        "binaryPath": "ios/build/Build/Products/Release-iphonesimulator/example.app",
        "build": "xcodebuild -project ios/example.xcodeproj -scheme example -configuration Release -sdk iphonesimulator -derivedDataPath ios/build",
        "type": "ios.simulator",
        "name": "iPhone 7 Plus"
      }
    } 
  }

3.1 Start using detox-cli

You will now be able to run builds and tests from your command line detox build and detox test, read more about CLI tools here

Migrating from detox 3.x.x to 4.x.x

If you have integrated with detox in version 3.x.x, you will need to clean your project from previously generated targets.

  • Use the provided cleanup_4.0.rb to remove unneeded changes made with Detox 4.x.x.

     ruby node_modules/detox/scripts/cleanup_4.0.rb

  • The script will delete previously configured project targets *_Detox. The targets are not used by detox anymore since the framework is now injected at runtime and doesn't need to be linked in a different target.

  • Make sure to add changes performed by running this script to version control.