E2E test for React Native EventSource implementation

App.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow
 */

import { Stitch, AnonymousCredential, RemoteMongoClient } from 'mongodb-stitch-react-native-sdk';
import React, {Component, Fragment} from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
} from 'react-native';

import {
  Colors,
} from 'react-native/Libraries/NewAppScreen';

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      stitchStatus: "logged out",
      latestEvent: "no recent events",
    }
  }

  componentDidMount() {
    Stitch.initializeAppClient("<stitch-app-id>").then(client => {
      const mongodb = client.getServiceClient(RemoteMongoClient.factory, "mongodb-atlas");
      const testCollection = mongodb.db("skunk").collection("works");
      client.auth.loginWithCredential(new AnonymousCredential()).then(user => {
        this.setState({stitchStatus: `logged in anonymously as user ${user.id}`});
        testCollection.watch().then(stream => {
          stream.onNext((event) => {
            this.setState({latestEvent: JSON.stringify(event)});
          });
        }) 
      });
    });
  }

  render() {
    return (
      <Fragment>
        <StatusBar barStyle="dark-content" />
        <SafeAreaView>
          <ScrollView
            contentInsetAdjustmentBehavior="automatic"
            style={styles.scrollView}>
            <View style={styles.body}>
            <View style={styles.sectionContainer}>
                <Text style={styles.sectionTitle}>Stitch Status</Text>
                <Text style={styles.sectionDescription}>
                  {this.state.stitchStatus}
                </Text>
              </View>
              <View style={styles.sectionContainer}>
                <Text style={styles.sectionTitle}>Latest Event</Text>
                <Text style={styles.sectionDescription}>
                  {this.state.latestEvent}
                </Text>
              </View>
            </View>
          </ScrollView>
        </SafeAreaView>
      </Fragment>
    );
  }
}

const styles = StyleSheet.create({
  scrollView: {
    backgroundColor: Colors.lighter,
  },
  engine: {
    position: 'absolute',
    right: 0,
  },
  body: {
    backgroundColor: Colors.white,
  },
  sectionContainer: {
    marginTop: 32,
    paddingHorizontal: 24,
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: '600',
    color: Colors.black,
  },
  sectionDescription: {
    marginTop: 8,
    fontSize: 18,
    fontWeight: '400',
    color: Colors.dark,
  },
  highlight: {
    fontWeight: '700',
  },
  footer: {
    color: Colors.dark,
    fontSize: 12,
    fontWeight: '600',
    padding: 4,
    paddingRight: 12,
    textAlign: 'right',
  },
});

export default App;