I'm trying to test a function that calls the module cors
. I want to test that cors
would be called. For that, I'd have to stub/mock it.
Here is the function cors.js
const cors = require("cors");
const setCors = () => cors({origin: 'http//localhost:3000'});
module.exports = { setCors }
My idea of testing such function would be something like
cors.test.js
describe("setCors", () => {
it("should call cors", () => {
sinon.stub(cors)
setCors();
expect(cors).to.have.been.calledOnce;
});
});
Any idea how to stub npm module?
You can use mock-require
or proxyquire
Example with mock-require
const mock = require('mock-require')
const sinon = require('sinon')
describe("setCors", () => {
it("should call cors", () => {
const corsSpy = sinon.spy();
mock('cors', corsSpy);
// Here you might want to reRequire setCors since the dependancy cors is cached by require
// setCors = mock.reRequire('./setCors');
setCors();
expect(corsSpy).to.have.been.calledOnce;
// corsSpy.callCount should be 1 here
// Remove the mock
mock.stop('cors');
});
});
If you want you can define the mock on top of describe and reset the spy using corsSpy.reset()
between each tests rather than mocking and stopping the mock for each tests.
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