Detox for E2E testing in React Native - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Detox in React Native testing?

Detox is a gray-box end-to-end testing framework for React Native apps. It automates user interactions and verifies app behavior on real devices or simulators.

intermediate

How does Detox synchronize with the app during tests?

Detox waits for the app to be idle before performing actions or assertions, ensuring tests run only when the app is ready, avoiding flaky tests.

beginner

Which command runs Detox tests on an Android emulator?

You run Detox tests on Android using: detox test -c android.emu.debug, where the config specifies the emulator and build.

beginner

What is the role of the beforeAll hook in Detox tests?

The beforeAll hook sets up the test environment, usually launching the app once before all tests run to save time.

beginner

Why is it important to use testIDs in React Native when using Detox?

TestIDs uniquely identify UI elements so Detox can find and interact with them reliably during tests.

What type of testing is Detox primarily used for?

A Integration testing

B Unit testing

C Snapshot testing

D End-to-end testing

Detox is designed for end-to-end testing, simulating real user interactions.

Which Detox command builds the app before testing?

A detox run

B detox start

C detox build

D detox launch

The detox build command compiles the app for testing.

How does Detox identify UI elements in React Native apps?

A Using element text only

B Using testID props

C Using accessibility labels only

D Using CSS selectors

Detox uses the testID prop to locate elements reliably.

What does Detox wait for before performing actions?

A App to be idle

B Network requests to finish only

C Animations to start

D User input

Detox waits for the app to be idle to avoid flaky tests.

Which testing framework is commonly used with Detox?

A Jest

B Mocha

C JUnit

D Karma

Jest is commonly used with Detox for writing test suites.

Explain how Detox ensures your React Native app is ready before running test actions.

Think about how Detox waits for the app to settle before clicking or typing.

Describe the steps to set up and run a basic Detox test on a React Native app.

Start from installation and end with running tests.