Angular window.open数据库模拟茉莉花

Question

我有一个角phonegap应用程序，我想展开使用window.openDatabase访问本地移动数据库。

我想单元测试创​​建/打开数据库的代码，我遇到了一些问题。

我有一个工厂：

'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}; 
    }]); 

除了作为一个茉莉测试：

'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/); 
    }); 
}); 

而且在运行时出现错误：

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 

谁能明白为什么_db在调用$ window.openDatabase后未定义？

更新：

问题是间谍。如果我删除mockspy = spyOn（$ window，'openDatabase'）;并更改测试以访问模拟函数内部的布尔变量集，一切正常！

Answer 1

更新：

问题是间谍。如果我删除mockspy = spyOn($window, 'openDatabase');并更改测试以访问模拟函数内部的布尔变量集合，则一切正常！