Angular window.open數據庫模擬茉莉花

Question

我有一個角phonegap應用程序，我想展開使用window.openDatabase訪問本地移動數據庫。

我想單元測試創​​建/打開數據庫的代碼，我遇到了一些問題。

我有一個工廠：

'use strict'; 

angular.module('data') 
    .factory('localStore', ['$window', 
    function ($window){ 
     var _db; 

     function _populate(tx){ 
      tx.executeSQL('CREATE TABLE IF NOT EXISTS TEST(id unique, description)'); 
     } 

     function _error(err){ 
      console.log('Error populating DB: ' + err.code); 
     } 

     function _success(){ 
      console.log('DB populate successful'); 
     } 

     function _initialise(){ 
      if ('undefined' === typeof _db){ 
      _db = $window.openDatabase("Database", "1.0", "My App", 100000); 
      _db.transaction(_populate, _error, _success); 
      } 
     } 

     return {initialise: _initialise}; 
    }]); 

除了作爲一個茉莉測試：

'use strict'; 

describe('localStore', function() { 
    var localStore, $window, txnspy, mockspy; 

    beforeEach(module('data')); 

    beforeEach(function(){ 
    txnspy = jasmine.createSpy('spy'); 

    inject(function(_localStore_, _$window_){ 
     localStore = _localStore_; 
     $window = _$window_; 

     $window.openDatabase = 
     function(db, version, name, size){ 
      // throw(new Error('Local open')); 
      return { 
       transaction: function(txnFn){ 
        txnFn({executeSql: txnspy}); 
      } 
      }; 
     }; 

     mockspy = spyOn($window, 'openDatabase'); 
    }); 
    }); 

    it('initialise defined', function(){ 
    expect(localStore.initialise).toBeDefined(); 
    }); 

    it('openDatabase', function(){ 
     localStore.initialise(); 
     expect(mockspy).toHaveBeenCalled(); 
     expect(txnspy).toHaveBeenCalled(); 
     expect(txnspy.calls.first().args[0]).toMatch(/^CREATE TABLE IF NOT EXISTS/); 
    }); 
}); 

而且在運行時出現錯誤：

ERROR [PhantomJS 1.9.8 (Linux 0.0.0) | localStore | openDatabase]: TypeError: 'undefined' is not an object (evaluating '_db.transaction') 
    at _initialise (http://0.0.0.0:8081/base/app/scripts/data/localStore.js?15494938407287b8b9ee539800f7a42ae33c9b79:9) 
    at http://0.0.0.0:8081/base/test/spec/data/localStore.js?7bcca70e4f2dd2473ec1ddb5d521f37ac7f4b423:43 

誰能明白爲什麼_db在調用$ window.openDatabase後未定義？

更新：

問題是間諜。如果我刪除mockspy = spyOn（$ window，'openDatabase'）;並更改測試以訪問模擬函數內部的布爾變量集，一切正常！

Answer 1

更新：

問題是間諜。如果我刪除mockspy = spyOn($window, 'openDatabase');並更改測試以訪問模擬函數內部的布爾變量集合，則一切正常！