@fuadop/react-native-store/lib/__tests__/mockStorage.js

A simple database base on react-native AsyncStorage.

"use strict"; // Replicate resolve and reject values from:
// https://github.com/facebook/react-native/blob/master/Libraries/Storage/AsyncStorage.js
// Haven't implemented callbacks as not yet used in react-native-store
// Haven't implemented multiGet/Set as not yet used in react-native-store

var cache = {};
var mock = {
  setItem: jest.genMockFunction().mockImplementation(function (key, value) {
    return new Promise(function (resolve, reject) {
      if (typeof key !== 'string' || typeof value !== 'string') reject(new Error('key and value must be string'));
      resolve(cache[key] = value);
    });
  }),
  getItem: jest.genMockFunction().mockImplementation(function (key) {
    return new Promise(function (resolve, reject) {
      if (cache.hasOwnProperty(key)) resolve(cache[key]);
      resolve(null);
    });
  }),
  removeItem: jest.genMockFunction().mockImplementation(function (key) {
    return new Promise(function (resolve, reject) {
      if (cache.hasOwnProperty(key)) resolve(delete cache[key]);
      reject('No such item!');
    });
  }),
  clear: jest.genMockFunction().mockImplementation(function () {
    return new Promise(function (resolve, reject) {
      resolve(cache = {});
    });
  }),
  getAllKeys: jest.genMockFunction().mockImplementation(function () {
    return new Promise(function (resolve, reject) {
      resolve(Object.keys(cache));
    });
  }),
  _forceClear: function _forceClear() {
    cache = {};
  }
};
module.exports = mock;