Angular 2 – Testing

Rick HerrmannWriting tests has been something I’ve been a proponent of for many years.  My testing experience started with C# and then continued on the front end with javascript and Angular 1.  So when I started learning Angular 2, I naturally wanted to see what the testing story was.

The front-end testing I’ve done in the past has always had some friction with respect to getting the tools setup properly.  Mostly I have used Jasmine as the testing framework, which is pretty self contained – but to get a node test server setup properly there are a variety of other npm modules and karma configuration settings to deal with.  I previously wrote about how the angular-cli makes it easy to get an Angular 2 project setup, and this includes getting the test tools setup as well.  So instead of dealing with configuration settings, you can quickly get to just writing tests.

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Javascript Testing with Jasmine

Rick HerrmannOne of the features I like about Jasmine is that the ability to mock objects and do interaction based testing is built into the tool.  When testing C# code (with NUnit, MSTest, or even NSpec) you have to pull in another tool to handle mocking.

In Jasmine, mock objects are called spies.  Accordingly, there is a built-in function called spyOn, which takes two parameters:

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