Mocha throws an unexpected AssertionError that is not being handled

I have encountered an error while writing a Mocha test for a module in my express application. I am unsure about how to resolve this issue.

Here is the test:

  describe('userController', function() {
    describe('post -> /create', function() {
      it('A user should be created', () => {
          var testRequest = {
              body: {
                  password:"pass1",
                  email:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ea9e8f999eaa87fc4898587">[email protected]</a>",
                  username:"user1",
              }
          };
          database.registerUser(testRequest, (callBack) => {
              new User({email:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d1a5b4a2a591bcb4ffb2bebc">[email protected]</a>"})
              .fetch()
              .then((model) => {
                 assert.equal(model.get('password'), testRequest.body.password);
              })
              .catch((err) => {
                assert(false);
              });
          });
      });
    });
  });

The Error: 

Unhandled rejection AssertionError: false == true
    at User.fetch.then.catch (/home/shanedrafahl/code/MyRentalServer/myRental/test/test.js:72:17)
    at tryCatcher (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/promise.js:512:31)
    at Promise._settlePromise (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/promise.js:569:18)
    at Promise._settlePromise0 (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/promise.js:689:18)
    at Async._drainQueue (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/home/shanedrafahl/code/MyRentalServer/myRental/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)

I would appreciate any guidance or insight on why this error is occurring and how I can resolve it.

javascriptexpressasynchronousmocha.js

Answer №1

It appears there are two issues at play here. The first being the actual problem you are facing, and the second being related to the test itself. Perhaps tackling the test problem first could shed light on how to approach solving the primary issue.

While I may not be well-versed in the workings of assert, based on the stack trace provided, it seems that you are anticipating assert to perform differently in this particular section:

.catch((err) => {
  assert(false);    // <---- the issue lies in the first parameter being false
});

Resolution (for the test problem)

It seems that what you actually intend to do is to output the contents of err. This could help in understanding the reason why you are encountering the catch block in the first place.

Given that your test is asynchronous, it might be beneficial to utilize done as shown below:

it('A user should be created', (done) => {  //added done parameter

...

.then((model) => {
  assert.equal(model.get('password'), testRequest.body.password);
  done() // signaling Mocha that the async test is completed
})
.catch((err) => {
  done(err) // notifying Mocha that the async test is finished with an error, allowing the error to be displayed in the output
});

By following these steps, you should be able to proceed with testing your code effectively, pinpointing the root cause of the underlying issue.

For further insights on asynchronous testing with Mocha, you can refer to the documentationhere: Mocha - Asynchronous Code

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