I was following the new .NET Core 2.2 –> 3.0 upgrade document, but when I updated my unit test project files, I accidentally set the SDK to Microsoft.NET.Sdk.Web because that’s what my ASP.NET Core 3.0 web project was. via GIPHY The unit tests still ran and worked… for the most part. One of them failed, … [Read more…]
Sometimes there’s a path in a service or application that you want to test where all it does is log something and return. You could check other things, but sometimes it is hard to check to see if something didn’t happen… and it would be a lot easier to know if something did happen, like … [Read more…]
Every now and again I find it necessary to set up the request body manually (as opposed to using the [FromBody] tag). In the controller you can read from the request body easily enough: via GIPHY Testing How do you test this? Normally I would just create a controller, call the method, and check the … [Read more…]
C# has a Stopwatch class that is pretty accurate at timing things. In fact, it uses some low-level operating system stuff to make sure to get exact timings. This means it can be more accurate than comparing two different DateTime.Now instances. via GIPHY I’ve found myself using the Stopwatch occasionally, but it always is kind … [Read more…]
XUnit has some cool stuff like Theory, which lets you write multiple test cases to run against the same test code. This lets you test multiple paths with different inputs without having to write multiple tests. This can save you a lot of time as you can cover a lot of ground with a single … [Read more…]
Last week I wrote about how to upload a file from a website using Angular and .NET Core. Writing tests for this is mostly straightforward, but there’s a few gotchas that I thought I would write down for the next time I need to do this. The front end tests are pretty trivial – you … [Read more…]
There’s several tutorials for how to use and test HttpClient, but I wanted to distill it down to a simple snippet that I can refer back to when I inevitably forget how to do it. via GIPHY HttpTestingController This handy thing is provided by importing the HttpClientTestingModule in to your TestBed. It lets you manipulate … [Read more…]
Recently, I was writing some unit tests for Angular. It was a pretty basic test, just checking to see if a method on an injected provider was called when a method in my component executed… but suddenly everything blew up with this weird error: TypeError: Cannot read property ‘ngInjectableDef’ of undefined Googling around didn’t really … [Read more…]
Sometimes when you’re writing Javascript unit tests you have to give Javascript a chance to catch up before checking your assertions. Javascript uses a single event loop, so it isn’t multi-threaded in the same way as other languages. You can still get a “multi-threaded feel” by using callbacks (promises, observables, etc), but at the end … [Read more…]
Recently I wrote some code that contained a setTimeout. The reason was so that the UI could catch up before the function actually fired – something that I’ve found the need to do with javascript from time to time. So, when it comes to testing the code… my test just skipped along until it literally … [Read more…]