When you are executing automated functional testing, there could be failures in critical test cases. In such situations, it may be worthless to continue test execution further. However, when you run automated functional test cases thorough VSTS/ TFS, until the full test execution finishes, you would not be able to view the individual test case status. This is a feature considered by Microsoft for VSTS in 2018 Q2 (for on premises TFS 2019) and until that shows up here is small workaround.