React Native

Maestro supports testing React Native screens and apps on both Android and iOS.
Interacting with a component by Text
Maestro can interact with components that display text.
Example: Tap on a Button
For the Button component definition:
<Button
	title="Go"
	onPress={() => Alert.alert('Success!')}
/>
The following command will tap on the Button:
- tapOn: "Go"
Interaction with a component by testID
Maestro can interact with components that have a testID.
Example: Tap on a button with a testID property
For the Button component definition:
<Button
	title="Go"
  testID="continue"
	onPress={() => Alert.alert('Success!')}
/>
The following command will tap on the Button:
- tapOn:
    id: "continue"
Entering text in a Text Input
Example: Enter text into a TextInput.
To input text to a TextInput component, first the component needs to be selected. This can be done using the tapOn command. For the component definition:
<TextInput placeholder="Change me!" />
The following commands will enter "Hello, Maestro!" in the TextInput component:
- tapOn: "Change me!"
- inputText: "Hello, Maestro!"
Create a working sample app with Maestro tests
Install Maestro
​Maestro install instructions​
Create a sample app
Follow the Expo Go Quickstart instructions on react native environment setup​
Replace the contents of App.js with:
import React, { useState } from 'react';
import { SafeAreaView, Button, Text, TextInput, StyleSheet } from 'react-native';
​
export default function App() {
  const [taps, setTaps] = useState(0);
  const [text, setText] = useState('')
  return (
    <SafeAreaView>
      <Button
        title="Add one"
        variant="primary"
        onPress={() => setTaps(taps + 1)}
      />
      <Button
        title="Add ten"
        testID="add_ten"
        onPress={() => setTaps(taps + 10)}
      />
      <Text>Number of taps: {taps}</Text>
      <TextInput
        testId="text_input"
        placeholder="Change me!"
        onChangeText={setText}
      />
      <Text>You typed: {text}</Text>
    </SafeAreaView>
  );
}
​
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});
Create a test definition file called flow.yaml
Add the following contents:
appId: host.exp.Exponent
---
- launchApp
- tapOn: "Add one"
- tapOn:
    id: "add_ten"
- assertVisible: "Number of taps: 11"
- tapOn: "Change me!"
- inputText: "Hello, Maestro!"
- assertVisible: "You typed: Hello, Maestro!"
Start the app and test using Maestro
Run npm start in the react native app source directory
Select either Android or iOS Simulator
In another terminal, run maestro test flow.yaml
When the Expo app launches, select the app that you’re testing
Demo
Screen Recording 2023-01-11 at 21.24.32.mov
28MB
Binary
React Native app tested using Maestro
Interacting with nested components on iOS
In some cases, you may run into issues with nested tappable / accessible elements on iOS. You can resolve these issues by enabling accessibility for the inner component and disabling it for the outer container.
Example: Tapping on nested Text Component
<TouchableOpacity 
  style={{ borderWidth: 1, margin: 5, padding: 10, backgroundColor: '#ddd' }} 
   accessible={false}>
  <Text>This is the wrapper button </Text>
  <TouchableOpacity 
    style={{ backgroundColor: 'red', padding: 5, width: '50%', marginTop: 10 }} 
     accessible={true}>
    <Text>I'm a small button</Text>
  </TouchableOpacity>
</TouchableOpacity>
 The following command will tap on the nested Text Component:
- tapOn: "I'm a small button"
Resources
​A great introduction to Maestro with React Native by Alexander Hodes
Getting Started

Last modified 8mo ago