rarwe.tar.gz

Ember

Ember-copy

ember2

embercss

rarwe

Ember-copy-5yvdqv

Ember-copy-5yvdqv-copy

Ember-Acceptest

Ember-Acceptest-copy

Ember-unitest

rarwe-copy

Ember-Acceptest-challenge

Ember-helper-challenge

In this course, you begin with an introduction to Ember.js, a JavaScript framework for building client-side applications.

After that, the course guides you through the steps of building a real application so that you can see how the concepts are applied in practice. You'll learn about the building blocks of Ember one by one, in a way that crushes the allegedly steep learning curve of the framework.

The application will get shinier (and/or more robust) with each chapter. By the end, we will have a decent app, and you'll have a great new skill you can add to your resume.

Developing Robust Ember.js Applications

# Test helpers
We have used a few of the test helpers, like `visit`, `click`, and `fillIn`. There are way more DOM helpers we haven’t used, but what all helpers have in common is that they wait for all async operations to finish before they resolve. We have to put `await` in front of them to make sure all effects of an action, like clicking a button, have been fully reflected in the DOM before we move on.

So, what can those async operations that the DOM helpers wait for be? Examples include route transitions, ajax requests, timers, and a few more.

Most of the time, we get away with using the DOM test helpers with `await` without worrying too much about async actions they trigger in the background. However, in some cases, we need to manually tell the test to wait until a certain condition is fulfilled. That’s why Ember provides lower-level, non-DOM test helpers, in the same package. The one that catches our attention is called `waitFor`. It will wait for a DOM element to be rendered on screen, and it has a timeout so that it doesn’t hang the test.

One element we can target this way is the text that is displayed when a band has no songs yet. This way, we know the empty songs page has been rendered for the new band, and we expect the band to appear in the band list by that time:

In this lesson, we’ll cover what DOM test helpers are and how to use them in an Ember application.

Settledness in Tests