How to mock express response object in node tests using mocha?
How to mock express response object in node tests using mocha?
1 answer
by
daisha ,
7 months ago
@lizzie
To mock an Express response object in Node tests using Mocha, you can use a library like sinon to create a stub of the response object. Here's an example of how you can mock an Express response object in a Mocha test:
- Install sinon package:
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npm install --save sinon |
- In your test file, import sinon and the Express module:
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const sinon = require('sinon');
const express = require('express');
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- Create a stub of the Express response object before running your test:
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describe('YourTestSuiteName', () => {
let res;
beforeEach(() => {
res = {
status: sinon.stub().returnsThis(),
send: sinon.stub()
};
});
it('should test something with mocked response object', () => {
// Your test code goes here
});
});
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- In your test case, you can then use the res object as a mock of the Express response object:
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it('should test something with mocked response object', () => {
// Call your Express route handler function with the mock response object
yourRouteHandler(req, res);
// Assert the response was sent with the expected data
sinon.assert.calledWith(res.send, 'Your expected response');
});
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By following these steps, you can successfully mock an Express response object in your Mocha tests using sinon.