Recently I had a problem where in an Angular unit test where I had an object that was being initialized in ngOnInit from a service. As far as I could tell, everything should be working, but the test would fail because I was trying to set a property on the object before it had finished … [Read more…]
The C# Interactive window allows you to use a C# REPL that can be pretty useful for testing something out quickly. I’ve used it a bunch of times for formatting a DateTime to a string, because I can never quite remember which combination of characters results in what I want. In Visual Studio, you can … [Read more…]
I find that writing unit tests in JavaScript kind of sucks, so this post will (hopefully) serve as a cheat sheet of all the stuff I keep looking up. As such, it will be updated as I learn new stuffs. How To: scope test run to specific tests Remember to set it back before you … [Read more…]
In the last post I talked about using and extending IActionResult to return your preferred HttpStatus code in your ASP.NET MVC controllers. But how do you write unit tests that make sure that you’re returning what you expect? Your controllers will return one of these: IActionResult There’s nothing on this interface that you can easily … [Read more…]
Unit testing can be annoying. Sometimes it feels like setting up a delicate house of cards in just the right way and hoping that nobody opens a window to let a breeze knock the whole thing over. If you’re using inversion of control (and you should be), its a little easier because you can use … [Read more…]
In the last blog post I talked about how to use Moq’s built in SetupSequence to create a “chain” of actions to execute for subsequent calls of the same mocked method. This works great for the simple case, but falls down when you have to do something a little more complicated like, say, issue a … [Read more…]
Say that you’re unit testing and you want a mocked interface to behave differently for different calls to the same method. I was trying to test a TCP listener loop – a TcpListener waits for an incoming connection, does something with it, and then goes back to listening. In essence, the loop will last until … [Read more…]
Sometimes I want to unit test the pieces of my code that are close to the transport layer, but often they are so close to the metal that it is hard to separate them. There’s really not a great way to abstract out the communication layer, so you just have to bite the bullet and … [Read more…]
I was trying to be good and keep up with my Karma unit tests in my Angular 5 Typescript project, but I was running in to a really weird error that left a lot to be desired: The logs in the console window are not helpful either… Chrome 63.0.3239 (Windows 10 0.0.0) ERROR Uncaught NetworkError: … [Read more…]
When you write code against an Observable, you subscribe to the result. In the subscribe method you provide the callbacks to perform when the Observable is called back. That means you can execute different code for success and failure. In the last post I wrote about how to mock up and test Observable<T> in Jasmine … [Read more…]