Live Unit Testing in Visual Studio 2017
Live Unit Testing is present in the Enterprise edition of Visual Studio 2017 and it's available for C# and VB projects that target the .NET Framework. It is a productivity feature, which provides real-time feedback directly in the editor on how code changes are impacting your unit tests and your code coverage. This will help you maintain quality by keeping the tests passing as you make changes. It will also remind you when you need to write additional unit tests as you are making bug fixes and adding features.
You can also read more about Live Unit Testing in this blog post: https://go.microsoft.com/fwlink/?linkid=842514