Creating unit tests for a javascript method that employs a JWT token

Question

Creating unit tests for a javascript method that employs a JWT token

Currently, I'm facing a challenge when writing unit tests in JavaScript for a method that includes JWT token validation. The method should only fetch results if the token is valid.

I'm looking to mock the JWT token and return results. I've attempted using the Ava test framework, mock require, and Sinon, but unfortunately, I've been unsuccessful so far.

Do you have any suggestions on how to achieve this?

Code:

Trying to mock jwt.verify    

**unit test:**

const promiseFn = Promise.resolve({ success: 'Token is valid' });

mock('jsonwebtoken', {
        verify: function () {         
            return promiseFn;   
        }
});

const jwt = require('jsonwebtoken');

const data =  jwt.verify(testToken,'testSecret');

console.log(data)


**Error :**

ERROR
    {"name":"JsonWebTokenError","message":"invalid token"} 


The issue at hand is that the token is being verified, but the mock is not being invoked.

javascript unit-testing jwt sinon ava

Answer 1

Answer №1

In Node.js, modules are treated as singletons. This means that if you require a module like 'jwt' in your test and then require it again in your business logic, it will refer to the same object.

Therefore, you can require the 'jwt' module in your test and then mock the verify method.

It's also crucial to remember to restore the mock after the test is completed.

Below is a simple example demonstrating how you can achieve this using ava and sinon:

const test = require('ava');
const sinon = require('sinon');
const jwt = require('jsonwebtoken');

let stub;

test.before(t => {
    stub = sinon.stub(jwt, 'verify').callsFake(() => {
        return Promise.resolve({success: 'Token is valid'});
    });
})

test('should return success', async t => {
    const testToken = 'test';
    const testSecret = 'test secret';

    const result = await jwt.verify(testToken, testSecret);

    console.log(result);

    t.is(result.success, 'Token is valid');
});

test.after('cleanup', t => {
    stub.restore();
})

Answer 2

In Node.js, modules are treated as singletons. This means that if you require a module like 'jwt' in your test and then require it again in your business logic, it will refer to the same object.

Therefore, you can require the 'jwt' module in your test and then mock the verify method.

It's also crucial to remember to restore the mock after the test is completed.

Below is a simple example demonstrating how you can achieve this using ava and sinon:

const test = require('ava');
const sinon = require('sinon');
const jwt = require('jsonwebtoken');

let stub;

test.before(t => {
    stub = sinon.stub(jwt, 'verify').callsFake(() => {
        return Promise.resolve({success: 'Token is valid'});
    });
})

test('should return success', async t => {
    const testToken = 'test';
    const testSecret = 'test secret';

    const result = await jwt.verify(testToken, testSecret);

    console.log(result);

    t.is(result.success, 'Token is valid');
});

test.after('cleanup', t => {
    stub.restore();
})

Creating unit tests for a javascript method that employs a JWT token

Answer №1

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