Next, we are going to test our middleware functions, starting with the checkEmptyPayload middleware. Like we did previously, move the middleware module into its own directory:
$ cd src/middlewares/ && \ mkdir check-empty-payload && \ mv check-empty-payload.js check-empty-payload/index.js && \ touch check-empty-payload/index.unit.test.js && \ cd ../../
Then, inside src/middlewares/check-content-type.js/index.unit.test.js, lay out the skeleton of our first test:
import assert from 'assert';
import checkEmptyPayload from '.';
describe('checkEmptyPayload', function () {
describe('When req.method is not one of POST, PATCH or PUT', function () {
it('should not modify res', function () {
// Assert that `res` has not been modified
});
it('should call next() once', function () {
// Assert that `next` has been called once
});
});});The purpose of the checkEmptyPayload middleware is to ensure that the POST...