title: What is PriorityAttribute Used for in MSTEST / Visual Studio
body: <p>I noticed the existence of Microsoft.VisualStudio.TestTools.UnitTesting.PriorityAttribute. From reading a little about it, it does not seem to have anything to do with the test execution order. That being the case, it begs the question: what is it used for?</p>
  
  <p>I'm curious, are there any known uses of this attribute either by Visual Studio itself of any plugins/frameworks.</p>