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
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
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
Last updated
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