Maestro by mobile.dev
Ask or search…
K

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

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