We recently finished bringing our test coverage up to 90%+ on our Angular project. The team worked hard and I am proud of our accomplishments. Going forward we are using TDD and this has proven to be an interesting experience that has provided new challenges. We have found building Angular directives through test driven development to be a little challenging since the templates haven't been built yet. We aren't going to know what to build right away, and we are loathe to break our rhythm and constantly be updating a template file. A bigger problem is the template creating an external dependency which is never a good thing for unit tests. When it comes time to do e2e testing and using Selenium or Protractor then the whole template needs to be run. If I'm starting with unit tests to define my code, how can I use a template without these problems? We found one method that we like - the $templateCache.
Selenium is the most talked about UI testing framework that I could find that was both open source and well supported. We decided to adopt it for our automated UI testing. I have found it to be very useful, albeit with a stiff learning curve. One downside for me is the back and forth between building tests and then waiting for Selenium and the browsers to open and run the tests. It occurred to me I could help alleviate this by having the browsers at the ready and eagerly waiting for the command to start testing. So I reached into my toolbox to grab one of my favorite tools, Node.js. Using Node.js I was able to build an interactive interface with which I can iteratively build my front end tests. Everything I needed was already there, I just had to put pieces together.
$httpBackend is one of the greatest things that AngularJs provides. $httpBackend intercepts AJAX requests made by Angular's $http service to allow for full unit testing. The ngTestHarness helps simplify interactions with the mock backend by abstracting away WHEN and EXPECT differences.