覆盖 node.js 中其他模块中的函数 [英] Overriding functions in other modules in node.js
问题描述
我正在尝试在 Node.js 应用程序中使用 nodeunit 存根一个函数.这是我正在尝试做的简化版本:
I'm trying to stub a function with nodeunit in a Node.js app. Here's a simplified version of what I'm trying to do:
在 lib/file.js
中:
var request = require('request');
var myFunc = function(input, callback){
request(input, function(err, body){
callback(body);
});
};
在test/test.file.js
中:
var file = require('../lib/file');
exports['test myFunc'] = function (test) {
request = function(options, callback){
callback('testbody');
};
file.myFunc('something', function(err, body){
test.equal(body, 'testbody');
test.done();
});
};
似乎我没有正确覆盖 request
,因为当我尝试运行测试时,实际的非存根 request
被调用,但我可以不知道正确的方法是什么.
It seems like I'm not overriding request
properly, because when I try to run the test, the actual non-stub request
is getting called, but I can't figure out what the correct way to do it is.
用我上面的例子来扩展下面 Ilya 的回答.
To expand on Ilya's answer below, with my example above.
在lib/file/js
中:
module.exports = function(requestParam){
return {
myFunc: function(input, callback){
requestParam(input, function(err, body){
callback(body);
});
}
}
}
然后在test/test.file.js
:
var fakeRequestFunc = function(input, callback){
// fake request function
}
var file = require('../lib/file')(fakeRequestFunc)(
//test stuff
}
推荐答案
正如您所注意到的,在一个模块中声明的变量不能轻易地从另一个模块访问.在这种情况下,您有两种常见的变体:
As you noticed, variables declared in one module, cannot easily be accessed from another module. In such cases, you have two common variants:
1) 在每个模块中声明你需要的一切(我想不是你的情况)
1) Declare everything you need in every module (not your case, I suppose)
2) 向函数传递参数
var ab = "foo",
index = require('/routes/index')(ab);
当您从模块中调用函数时,您可以向它传递请求"或您需要的任何其他变量或对象.
When you call a function form a module, you may pass it 'request' or any other vars or object you need.
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