C# Code Coverage with Azure DevOps

I wrote this how-to blog post for myself to sort out how to get code coverage for C# in Azure DevOps' build pipelines. There are many blog posts about this but this one guides how to get reports even if there are many unit test projects in Visual Studio solution.

Mock Object Vocabulary

We often talk about mocks, even if should use more precise terms like stub, fake and mock. Correct term for these is test double. In this blog post I introduce these different test doubles with code examples.

Create Objects With Test Data Builders (Unit Test Helper)

Anyone who has written unit tests have been fighting with object creations. Some times it is so difficult to create objects used in tests. Test data builders come to rescue! With them I write better tests with less time.

ApprovalTests, One of My Favorite NuGet

ApprovalTests is one of my favorite NuGet in C#. It helps you to verify is your method's output or object changed. It will automatically visualize the error by opening your diff tool and shows the difference there. I really recommend you to become familiar with this if you are a C# developer.

Automatic Rollback to Integration Tests in C#

This is something that has made my integration tests better. You define a test method to run in transaction and rollback at the end of each test. This makes it possible to write integration tests that write to the database. And tests won't leave any "garbage" there because rollback at the end of the test undoes all database updates (and inserts and deletes). If this is possible in your language and testing framework I strongly recommend it. In this blog post I will explain how you can do it with NUnit in C#.

Constant or static readonly?

SonarQube has two rules about constant and static readonly:
- Public constant members should not be used and
- Static readonly constants should be const instead.
I wrote this blog post to learn these rules and their difference. Now I know when to use const and when to use static readonly.

C#: Difference of Properties and Fields

I didn't clearly understand what is field and property in C#. So I decided to write this blog post to finally learn what is field and what is property and how I should use them.