Mock a node.js API call using sinon

Question

I have an api in index.js which does a post request. The method which does the channel subscription is subscribeToChannel. I would like to know some hint. I am new to nodejs and I am feeling a bit tough to mock/stub objects using sinon. Mockito for java was easier. I am using mocha, chai but none of them I feel is comfartable and feel very very trickey may be because of less exposure of Nodejs.

The below API doesnt even have a module.exports=server variable inorder to inject or call the method. How do I mock the methods of below file. Reply will be appreciated.

I think you forgot to include a link to the API. Can you please share your progress so far? Please see How to Create a Minimum, Complete, and Verifiable example for help. — sbolel
– sbolel, Commented Jan 23, 2018 at 17:16

danday74 · Accepted Answer · 2018-01-08 08:57:50Z

2

To mock the response of an API call you use nock:

https://www.npmjs.com/package/nock

You use it inside your mocha chai unit tests.

Basically with nock you say ... when a POST is made to /my/endpoint THEN respond with ... your mock response

Hopefully this is what you need.

Alternatively, if you don't need to mock an HTTP request but a node JS library then you can wrap that library in your own code and then mock your wrapper methods.

answered Jan 8, 2018 at 8:57

danday74

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3 Comments

Sawyer Over a year ago

Could you please let me know what you meant by " can wrap that library in your own code".

danday74 Over a year ago

you could wrap it like this ... module.exports = () => { theirLib.theirFunc() } ... then use sinon's callsFake .. see stackoverflow.com/questions/21072016/… - here you would prob wanna export a class instead of a function

Sawyer Over a year ago

I don' t have the possibility for { theirLib.theirFunc() } as there is no module.exports for the index.js file where the above code is. I don't have any possibility to export or wrap the functions. If I do var index= require('./index.js') then next how should I call the above functionality. And if I wrap the code how can I achieve 100% code coverage as I am not even utilising the require of index.js and without an entry point to it

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