javascript - 使用 jasmine-node 监视全局函数

Question

我正在使用 jasmine-node 对 javascript 代码进行单元测试。我有许多全局函数，我想监视它们并允许调用通过原始实现进行调用。请参阅下面的代码作为示例。

由于我无法解释的原因，我看到错误“globalFunction() 方法不存在”。

有人能告诉我为什么 jasmine 找不到这个我理解为在全局范围内的 globalFunction 方法。

感谢您的帮助

var globalFunction = function() {
    console.log('globalFunction');
};

describe("A Global Function", function() {
    jasmine.getEnv().addReporter(new jasmine.ConsoleReporter(console.log));
    it("may be spied upon", function() {
        spyOn(global,'globalFunction').andCallThrough();
        globalFunction();
        expect(globalFunction).toHaveBeenCalled();
    });
});

这是 Jasmine Node 的输出

$ jasmine-node  --verbose test.spec.js 
Runner Started.
A Global Function : may be spied upon ... 
Failed.
A Global Function: 0 of 1 passed.

A Global Function
  may be spied upon

Failures:

  1) may be spied upon
   Message:
     globalFunction() method does not exist
   Stacktrace:
     undefined

Finished in 0.008 seconds
1 test, 1 assertion, 1 failure


Runner Finished.
1 spec, 1 failure in 0.008s.    

Answer 1

您的globalFunction 实际上不是全局的。删除 var 关键字以使其成为全局关键字。

globalFunction = function() {
    console.log('globalFunction');
};

In browsers, the top-level scope is the global scope. That means that in browsers if you're in the global scope var something will define a global variable. In Node this is different. The top-level scope is not the global scope; var something inside a Node module will be local to that module.