react-native/IntegrationTests/AppEventsTest.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
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*
* @format
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* @flow
*/
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'use strict';
var React = require('react');
var ReactNative = require('react-native');
var {NativeAppEventEmitter, StyleSheet, Text, View} = ReactNative;
var {TestModule} = ReactNative.NativeModules;
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var deepDiffer = require('deepDiffer');
var TEST_PAYLOAD = {foo: 'bar'};
type AppEvent = {data: Object, ts: number};
type State = {
sent: 'none' | AppEvent,
received: 'none' | AppEvent,
elapsed?: string,
};
class AppEventsTest extends React.Component<{}, State> {
state: State = {sent: 'none', received: 'none'};
componentDidMount() {
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NativeAppEventEmitter.addListener('testEvent', this.receiveEvent);
var event = {data: TEST_PAYLOAD, ts: Date.now()};
TestModule.sendAppEvent('testEvent', event);
this.setState({sent: event});
}
receiveEvent = (event: any) => {
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if (deepDiffer(event.data, TEST_PAYLOAD)) {
throw new Error('Received wrong event: ' + JSON.stringify(event));
}
var elapsed = Date.now() - event.ts + 'ms';
this.setState({received: event, elapsed}, () => {
TestModule.markTestCompleted();
});
};
render() {
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return (
<View style={styles.container}>
<Text>{JSON.stringify(this.state, null, ' ')}</Text>
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</View>
);
}
}
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AppEventsTest.displayName = 'AppEventsTest';
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var styles = StyleSheet.create({
container: {
margin: 40,
},
});
module.exports = AppEventsTest;