text: /**
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   *
   * @format
   * @flow
   */
  
  'use strict';
  
  const React = require('react');
  const ReactNative = require('react-native');
  const {AsyncStorage, Text, View, StyleSheet} = ReactNative;
  const {TestModule} = ReactNative.NativeModules;
  
  const deepDiffer = require('react-native/Libraries/Utilities/differ/deepDiffer');
  
  const DEBUG = false;
  
  const KEY_1 = 'key_1';
  const VAL_1 = 'val_1';
  const KEY_2 = 'key_2';
  const VAL_2 = 'val_2';
  const KEY_MERGE = 'key_merge';
  const VAL_MERGE_1 = {foo: 1, bar: {hoo: 1, boo: 1}, moo: {a: 3}};
  const VAL_MERGE_2 = {bar: {hoo: 2}, baz: 2, moo: {a: 3}};
  const VAL_MERGE_EXPECT = {foo: 1, bar: {hoo: 2, boo: 1}, baz: 2, moo: {a: 3}};
  
  // setup in componentDidMount
  let done = (result: ?boolean) => {};
  let updateMessage = (message: string) => {};
  
  function runTestCase(description: string, fn) {
    updateMessage(description);
    fn();
  }
  
  function expectTrue(condition: boolean, message: string) {
    if (!condition) {
      throw new Error(message);
    }
  }
  
  function expectEqual(lhs, rhs, testname: string) {
    expectTrue(
      !deepDiffer(lhs, rhs),
      'Error in test ' +
        testname +
        ': expected\n' +
        JSON.stringify(rhs) +
        '\ngot\n' +
        JSON.stringify(lhs),
    );
  }
  
  function expectAsyncNoError(place, err) {
    if (err instanceof Error) {
      err = err.message;
    }
    expectTrue(
      err === null,
      'Unexpected error in ' + place + ': ' + JSON.stringify(err),
    );
  }
  
  function testSetAndGet() {
    AsyncStorage.setItem(KEY_1, VAL_1, err1 => {
      expectAsyncNoError('testSetAndGet/setItem', err1);
      AsyncStorage.getItem(KEY_1, (err2, result) => {
        expectAsyncNoError('testSetAndGet/getItem', err2);
        expectEqual(result, VAL_1, 'testSetAndGet setItem');
        updateMessage('get(key_1) correctly returned ' + result);
        runTestCase('should get null for missing key', testMissingGet);
      });
    });
  }
  
  function testMissingGet() {
    AsyncStorage.getItem(KEY_2, (err, result) => {
      expectAsyncNoError('testMissingGet/setItem', err);
      expectEqual(result, null, 'testMissingGet');
      updateMessage('missing get(key_2) correctly returned ' + result);
      runTestCase('check set twice results in a single key', testSetTwice);
    });
  }
  
  function testSetTwice() {
    AsyncStorage.setItem(KEY_1, VAL_1, () => {
      AsyncStorage.setItem(KEY_1, VAL_1, () => {
        AsyncStorage.getItem(KEY_1, (err, result) => {
          expectAsyncNoError('testSetTwice/setItem', err);
          expectEqual(result, VAL_1, 'testSetTwice');
          updateMessage('setTwice worked as expected');
          runTestCase('test removeItem', testRemoveItem);
        });
      });
    });
  }
  
  function testRemoveItem() {
    AsyncStorage.setItem(KEY_1, VAL_1, () => {
      AsyncStorage.setItem(KEY_2, VAL_2, () => {
        AsyncStorage.getAllKeys((err, result) => {
          expectAsyncNoError('testRemoveItem/getAllKeys', err);
          expectTrue(
            result.indexOf(KEY_1) >= 0 && result.indexOf(KEY_2) >= 0,
            'Missing KEY_1 or KEY_2 in ' + '(' + result + ')',
          );
          updateMessage('testRemoveItem - add two items');
          AsyncStorage.removeItem(KEY_1, err2 => {
            expectAsyncNoError('testRemoveItem/removeItem', err2);
            updateMessage('delete successful ');
            AsyncStorage.getItem(KEY_1, (err3, result2) => {
              expectAsyncNoError('testRemoveItem/getItem', err3);
              expectEqual(
                result2,
                null,
                'testRemoveItem: key_1 present after delete',
              );
              updateMessage('key properly removed ');
              AsyncStorage.getAllKeys((err4, result3) => {
                expectAsyncNoError('testRemoveItem/getAllKeys', err4);
                expectTrue(
                  result3.indexOf(KEY_1) === -1,
                  'Unexpected: KEY_1 present in ' + result3,
                );
                updateMessage('proper length returned.');
                runTestCase('should merge values', testMerge);
              });
            });
          });
        });
      });
    });
  }
  
  function testMerge() {
    AsyncStorage.setItem(KEY_MERGE, JSON.stringify(VAL_MERGE_1), err1 => {
      expectAsyncNoError('testMerge/setItem', err1);
      AsyncStorage.mergeItem(KEY_MERGE, JSON.stringify(VAL_MERGE_2), err2 => {
        expectAsyncNoError('testMerge/mergeItem', err2);
        AsyncStorage.getItem(KEY_MERGE, (err3, result) => {
          expectAsyncNoError('testMerge/setItem', err3);
          expectEqual(JSON.parse(result), VAL_MERGE_EXPECT, 'testMerge');
          updateMessage('objects deeply merged\nDone!');
          runTestCase('multi set and get', testOptimizedMultiGet);
        });
      });
    });
  }
  
  function testOptimizedMultiGet() {
    let batch = [[KEY_1, VAL_1], [KEY_2, VAL_2]];
    let keys = batch.map(([key, value]) => key);
    AsyncStorage.multiSet(batch, err1 => {
      // yes, twice on purpose
      [1, 2].forEach(i => {
        expectAsyncNoError(`${i} testOptimizedMultiGet/multiSet`, err1);
        AsyncStorage.multiGet(keys, (err2, result) => {
          expectAsyncNoError(`${i} testOptimizedMultiGet/multiGet`, err2);
          expectEqual(result, batch, `${i} testOptimizedMultiGet multiGet`);
          updateMessage(
            'multiGet([key_1, key_2]) correctly returned ' +
              JSON.stringify(result),
          );
          done();
        });
      });
    });
  }
  
  class AsyncStorageTest extends React.Component<{...}, $FlowFixMeState> {
    state: any | {|done: boolean, messages: string|} = {
      messages: 'Initializing...',
      done: false,
    };
  
    componentDidMount() {
      done = () =>
        this.setState({done: true}, () => {
          TestModule.markTestCompleted();
        });
      updateMessage = msg => {
        this.setState({messages: this.state.messages.concat('\n' + msg)});
        DEBUG && console.log(msg);
      };
      AsyncStorage.clear(testSetAndGet);
    }
  
    render(): React.Node {
      return (
        <View style={styles.container}>
          <Text>
            {/* $FlowFixMe(>=0.54.0 site=react_native_fb,react_native_oss) This
             * comment suppresses an error found when Flow v0.54 was deployed.
             * To see the error delete this comment and run Flow. */
            this.constructor.displayName + ': '}
            {this.state.done ? 'Done' : 'Testing...'}
            {'\n\n' + this.state.messages}
          </Text>
        </View>
      );
    }
  }
  
  const styles = StyleSheet.create({
    container: {
      backgroundColor: 'white',
      padding: 40,
    },
  });
  
  AsyncStorageTest.displayName = 'AsyncStorageTest';
  
  module.exports = AsyncStorageTest;
  