为什么sinon不认得我的存根？

Question

Let's say I have a module that exports like this:

module.exports = mymodule;

Then in my test file, I require the module and stub it.

var mymodule = require('./mymodule');

describe('Job gets sports data from API', function(){

    context('When there is a GET request', function(){
        it('will call callback after getting response', sinon.test(function(done){
            var getRequest = sinon.stub(mymodule, 'getSports');
            getRequest.yields();
            var callback = sinon.spy();
            mymodule.getSports(callback);
            sinon.assert.calledOnce(callback);
            done();
        }));
    });
});

That works and the test passes! But everything breaks down if I need to export more than one object. See below:

module.exports = {
    api: getSports,
    other: other
};

Then I try to adjust my test code:

var mymodule = require('./mymodule');

describe('Job gets sports data from API', function(){

    context('When there is a GET request', function(){
        it('will call callback after getting response', sinon.test(function(done){
            var getRequest = sinon.stub(mymodule.api, 'getSports');
            getRequest.yields();
            var callback = sinon.spy();
            mymodule.api.getSports(callback);
            sinon.assert.calledOnce(callback);
            done();
        }));
    });
});

In this case, my test craps out. How can I change my stub code to work? Thanks!

Answer 1

Based on this

module.exports = {
    api: getSports,
    other: other
};

it looks like mymodule.api doesn't itself have a getSports method. Rather, mymodyle.api is a reference to a getSports function insider your module.

Instead of stubbing getSports you would need to stub api :

var getRequest = sinon.stub(mymodule, 'api');

However, given how you're trying to stub getSports , you might instead want to update how you are exporting the function instead of how you are stubbing it.