Building Enterprise JavaScript Applications

Improving test coverage

First, inside the /home/dli/.d4nyll/.beja/final/code/9/src/handlers/users/create/index.js file, change the return undefined; statement to propagate the error down the promise chain:

      return res.json({ message: err.message });    }    throw err;  }).catch(() => {    res.status(500);

Then, add unit tests to src/handlers/users/create/index.unit.test.js to cover this missed scenario:

const generateCreateStubs = {  success: () => stub().resolves({ _id: USER_ID }),  genericError: () => stub().rejects(new Error()),  validationError: () => stub().rejects(new ValidationError(VALIDATION_ERROR_MESSAGE)),};...describe('createUser', function () {  ...  describe('When create rejects with an instance of Error', function () { beforeEach(function ...