Mastering Unit Testing in C#: A Beginner's Guide

So, what is unit testing? That is the question for this lecture. At the end of this lecture, you will have your answer.

Now we know what unit testing is I will answer the next question: Why?

Assertions are the biggest part of unit tests. But what are they and how do we use them?

There are two most used frameworks for unit testing C#: NUnit and XUnit. In this lecture I am going to explain the differences between them.

Time to write some code. In this lecture, I am explaining my starting point, create a basic unit test, and explain how you can run and check the results of your tests.

Creating code usually starts with a blank file, then it's full of code. This also happens with unit testing. So let's clean up a bit after the previous demonstration.

If a method throws an exception you should test if this exception is thrown and if it gives the correct information. Exceptions are a bit different if you want to test them. Let's take a look at how we can test them.

In some cases, your class or method needs external information. From a database for example. With unit testing, you don't want to access external sources like a database or API. And that's where mocking comes to help us. This is really important, maybe the most important part of this course.

Let's recap on what we have learned and how to continue from here.