The new Live Unit Testing feature in Visual Studio 2017 allows us to quickly see the code coverage details and the unit test case execution result, without leaving the code editor window. The Live Unit Testing automatically runs the impacted unit tests in the background as we edit the source code, and in real time it visualizes the unit testing result and coverage within the editor.

It currently supports C#/VB.NET projects targeting the .NET Framework, but only in Visual Studio 2017 Enterprise edition. When enabled, the unit test results and visualization of the code coverage results appear on a line-by-line basis in the editor, as shown in the following screenshot:

The live feedback notifies us in real time of the change that has broken the program. This way it helps you to maintain the quality of code by ensuring that the tests are always being passed as you make the changes to a new feature or a bug fix.

In the preceding screenshot, check the left-hand side bar, which has green marks and red icons. This provides live notification of the unit test results.