Test run pending trouble

Sometimes when I start unit test from visual studio all test are in pending phase and no test will run.
Open task manager find proses named as VSTestHost.exe and kill it. After that try to start tests again.
It works for me.

And here is macro to do that for you

Sub KillDeadTestProcess()
      Dim objProcess As System.Diagnostics.Process
      For Each objProcess In System.Diagnostics.Process.GetProcesses()
          Debug.Print(objProcess.ProcessName)
          If (objProcess.ProcessName = "VSTestHost") Then
              objProcess.Kill()
          End If
      Next
  End Sub