AngularJS Essentials

Unit Testing
Have you ever stopped to think about how much time we've spent just to
understand and reproduce a defect? After this, we need to spend even more time
looking for, between thousands of lines, the exact piece of the code that is causing
this defect. Many times, the fastest, and perhaps the easiest step is fixing it. And
what about manually testing the code repeatedly? Every time anything is changed,
you need to test it again. However, as the nature of software is all about changing,
test automation should be considered as an important long-term investment that will
support a sustainable pace and also improve the quality of each release.
Talking about quality, tests are the seeds of quality. Without that, nobody would
have enough confidence, or even courage, to improve the existing code by
refactoring it more often. Therefore, we could accumulate too much technical debt,
affecting the productivity and also bringing down the motivation of the team.
In the case of JavaScript, it is a very dynamic language that provides a strong
combination of both functional and object-oriented paradigms. However, despite
the advantage of being interpreted easily, JavaScript comes with a risk. The lack of a
compiler may lead you to introduce many syntax errors such as unknown variables
or function names, missing semicolons, and many others.
Beyond tools such as JSLint and JSHint that verify our code by looking for the most
common syntax errors, there are many testing frameworks available for JavaScript.
We are going to use Jasmine, which is easy to use and also has a great community
and support.
In order to test the AngularJS components, we'll use a module called ngMock that
supports dependency injection and also comes with a mocking mechanism.
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