Intro to Unit Testing in C# using XUnit

Unit testing is an important part of writing quality software. It is also a controversial and somewhat difficult topic to get started in. In this video, we walk through why we would use unit testing, what a unit test is, how to create a test, and how to deal with some of the more difficult situations.

Along the way, we will cover best practices, the pitfalls to avoid, and how to write more testable code.

This video uses XUnit instead of NUnit or MSTest based upon my preference. However, the techniques taught will apply to other test types.

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0:00 - Intro
1:37 - Working environment
3:35 - Demo application walk-through
7:14 - Unit Testing explained
9:45 - Creating a Unit Test project
13:22 - Setting up a test
22:37 - A bad Unit Test and Test Driven Development
25:48 - Opinion on Unit Testing
28:40 - Shortening Test name
31:08 - "Theory": Test method parameters and arguments
36:09 - Testing edge cases
38:43 - Testing number division
43:13 - Dividing by zero
48:55 - Testing methods that can throw exceptions: method returns output
54:14 - Debugging the Unit Test
55:19 - Testing the exceptions: method throws exception
59:22 - Testing the exceptions: method argument throws exception
1:05:07 - Testing methods that do more than one thing: what is a Unit of work?
1:10:56 - Breaking method in to individual methods, what to test and what not to test
1:18:50 - "Add to List" Tests: working test
1:26:50 - "Add to List" Tests: failing test
1:35:37 - Homework
1:40:05 - Concluding remarks