Visual Studio 2017 provides a seamless coding and testing environment. The Live Unit Testing and the Test Explorer inside Visual Studio are synchronized to give a proficient coverage over the unit test execution throughout the project/solution.

While you are modifying the existing code, the Live Unit Testing executes in the background for the impacted test cases for which you are changing the code, and based on that, it lists the result in the Test Explorer automatically, and in well-defined text.

When there are some non-impacted test cases available, those get listed as dimmed: