nx/docs/shared/detox-plugin.md

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# Detox Plugin
![Detox logo](/shared/detox-logo.png)
Detox is gray box end-to-end testing and automation library for mobile apps. It has a lot of great features:
- Cross Platform
- Runs on Devices
- Automatically Synchronized
## How to Use Detox
### Setup
#### Install applesimutils (Mac only)
[applesimutils](https://github.com/wix/AppleSimulatorUtils) is a collection of utils for Apple simulators.
```sh
brew tap wix/brew
brew install applesimutils
```
#### Install Jest Globally
```sh
npm install -g jest
```
### Generating Applications
By default, when creating a mobile application, Nx will use Detox to create the e2e tests project.
```bash
nx g @nrwl/react-native:app frontend
```
```treeview
<workspace name>/
├── apps/
│ ├── frontend/
│ └── frontend-e2e/
│ ├── .detoxrc.json
│ ├── src/
│ │ └── app.spec.ts
│ ├── .babelrc
│ ├── jest.config.json
│ ├── project.json
│ ├── tsconfig.e2e.json
│ └── tsconfig.json
├── libs/
├── tools/
├── babel.config.json
├── jest.config.js
├── jest.preset.js
├── nx.json
├── package.json
├── tsconfig.base.json
└── workspace.json
```
### Creating a Detox E2E project for an existing project
You can create a new Detox E2E project for an existing mobile project.
If the `@nrwl/detox` package is not installed, install the version that matches your `@nrwl/workspace` version.
```sh
# yarn
yarn add --dev @nrwl/detox
```
```sh
# npm
npm install --save-dev @nrwl/detox
```
Next, generate an E2E project based on an existing project.
```sh
nx g @nrwl/detox:app your-app-name-e2e --project=your-app-name
```
Replace `your-app-name` with the app's name as defined in your `workspace.json` file.
In addition, you need to follow [instructions at Detox](https://github.com/wix/Detox/blob/master/docs/Introduction.Android.md) to do manual setup for Android files.
### Testing Applications
- Run `nx test-ios frontend-e2e` to build the iOS app and execute e2e tests with Detox for iOS (Mac only)
- Run `nx test-android frontend-e2e` to build the Android app and execute e2e tests with Detox for Android
You can run below commands:
- `nx build-ios frontend-e2e`: build the iOS app (Mac only)
- `nx build-android frontend-e2e`: build the Android app
### Testing against Prod Build
You can run your e2e test against a production build:
- `nx test-ios frontend-e2e --prod`: to build the iOS app and execute e2e tests with Detox for iOS with Release configuration (Mac only)
- `nx test-android frontend-e2e`: rto build the Android app and execute e2e tests with Detox for Android with release build type
- `nx build-ios frontend-e2e --prod`: build the iOS app using Release configuration (Mac only)
- `nx build-android frontend-e2e --prod`: build the Android app using release build type
### Using .detoxrc.json
If you need to fine tune your Detox setup, you can do so by modifying `.detoxrc.json` in the e2e project.
#### Change Testing Simulator/Emulator
For iOS, in terminal, run `xcrun simctl list` to view a list of simulators on your Mac. To open your active simulator, `run open -a simulator`. In `frontend-e2e/.detoxrc.json`, you could change the simulator under `devices.simulator.device`.
For Android, in terminal, run `emulator -list-avds` to view a list of emulators installed. To open your emulator, run `emulator -avd <your emulator name>`. In `frontend-e2e/.detoxrc.json`, you could change the simulator under `devices.emulator.device`.
In additon, to override the device name specified in a configuration, you could use `--device-name` option: `nx test-ios <app-name-e2e> --device-name "iPhone 11"`. The `device-name` property provides you the ability to test an application run on specific device.
```bash
nx test-ios frontend-e2e --device-name "iPhone 11"
nx test-android frontend-e2e --device-name "Pixel_4a_API_30"
```