Add a file android/app/src/androidTest/java/com/[your.package]/DetoxTest.java and fill as in the detox example app for NR. Don’t forget to change the package name to your project’s (create folder androidTest if you need).
- Add Detox configuration to package.json
“detox” : {
“configurations”: {
“android.emu.debug”: {
“binaryPath”: “android/app/build/outputs/apk/debug/app-debug.apk”,
“build”:
“cd android && ./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug && cd ..”,
“type”: “android.emulator”,
“device”: {
“avdName”: <your_emulator_abd_name>
}
},
“android.emu.release”: {
“binaryPath”: “android/app/build/outputs/apk/release/app-release.apk”,
“build”: “cd android && ./gradlew assembleRelease assembleAndroidTest -DtestBuildType=release && cd ..”,
“type”: “android.emulator”,
“device”: {
“avdName”: <your_emulator_abd_name>
}
}
}
}
note: You can get your list of available emulators with the following commands:
cd $ANDROID_SDK_ROOT/emulator
./emulator -list-avds
Step 3: Writing a basic test case.
Let’s assume we want to start a test interacting with a TouchableOpacity. First thing we need is to define a testID so we can reference the ponent via a Detox test:
<View>
<TouchableOpacity testID=’MyUniqueId123′>
<Text>Some button</Text>
</TouchableOpacity>
</View>
Note: since Detox forces us to define IDs for the componentes, it is considered a “gray-box” testing framework due to the fact that the code will reflect the fact that it is tested with Detox through this property.
Create a .spec.js file inside e2e folder (or use the existing file firstTest.spec.js) and paste the following code:
//Define a test block
describe(‘App Tests’, () => {
//Reset the App before each test
beforeEach(async () => {
await device.reloadReactNative();
});
//Define a test case
it(‘test case description’, async () => {
//Your Code here, for example await element(by.id(‘id’)).tap()
});
})
Match the element and perform an action:
await element(by.id(‘MyUniqueId123’)).tap();
Set an expectation on the result:
await expect(element(by.id(‘AnotherUniqueId456’))).toBeVisible();
Step 4: Running the test.
Build the app:
detox build
Then, the tests can be run with the following commands
- Android:
detox test -c android.emu.debug
- IOS:
detox test -c ios.sim.debug
The command above will run the test (files with extension .spec.js) inside e2e folder.
That’s it. Your first failing Detox test is running!
Make more tests:
You can create more complex tests using the Detox API:
