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我正在尝试为我的服务器端逻辑编写一些单元测试，使用node.js框架编写。我想用jasmine库进行单元测试和模拟，因为我对它有点熟悉。现在node.js - 茉莉花模拟模块
，我想是这样的，以模拟文件系统read功能：
'use strict';
var loginRedirectMiddleware = require('../server/loginRedirectMiddleware');
var fs = require('fs');
var util = require('../server/util');
describe('loginRedirectMiddleware', function(){
spyOn(fs,'read');
...
});
现在我正在上线的误差spyOn调用：
1) loginRedirectMiddleware encountered a declaration exception
Message:
TypeError: Cannot call method 'spyOn' of null
Stacktrace:
TypeError: Cannot call method 'spyOn' of null
at null.<anonymous> (/home/adebksi/Nauka/js-linkedin-connector/server_test/loginRedirectMiddlewareSpec.js:11:3)
at Object.<anonymous> (/home/adebksi/Nauka/js-linkedin-connector/server_test/loginRedirectMiddlewareSpec.js:10:1)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (/home/adebksi/Nauka/js-linkedin-connector/node_modules/karma/node_modules/coffee-script/lib/coffee-script/coffee-script.js:211:36)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.jasmine.executeSpecsInFolder (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt-jasmine-node/node_modules/jasmine-node/lib/jasmine-node/index.js:151:9)
at Object.<anonymous> (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt-jasmine-node/tasks/jasmine-node-task.js:110:19)
at Object.thisTask.fn (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/grunt/task.js:78:16)
at Object.<anonymous> (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/util/task.js:282:30)
at Task.runTaskFn (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/util/task.js:235:24)
at Task.<anonymous> (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/util/task.js:281:12)
at Task.start (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/util/task.js:290:5)
at Object.grunt.tasks (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/grunt.js:155:8)
at Object.module.exports [as cli] (/home/adebksi/Nauka/js-linkedin-connector/node_modules/grunt/lib/grunt/cli.js:38:9)
at Object.<anonymous> (/home/adebksi/.nvm/v0.10.15/lib/node_modules/grunt-cli/bin/grunt:41:20)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:901:3
我想知道我是什么我做错了？
当我做console.log(typeof fs.read)我得到function所以这个属性是一个函数。