Those of you who have switched over to xUnit.Net may have a received a nasty surprise with the 'type members layout' feature of ReSharper: it doesn't respect method attributes. Namely, you can tell it to not reorder methods in an NUnit fixture like this: 

<Pattern>   
 <Match>   
    <HasAttribute CLRName="NUnit.Framework.TestFixture"/>   
  </Match>   
</Pattern>

But you cannot tell it to not reorder your xUnit methods like this:  

<Pattern> 
       <Match> 
         <And Weight="100"> 
           <Kind Is="method"/> 
           <HasAttribute CLRName="Xunit.TestAttribute" Inherit="false"/> 
          </And> 
       </Match> 
</Pattern>

Apparently it will only look for attributes on classes and interfaces. In the meantime, I think the simplest solution is to just create a fake attribute you can add to your fixture. 

public class ReSharperNoReorderAttribute : Attribute 
{ 
}

And the appropriate pattern match to ReSharper:

<Pattern>
       <Match> 
          <HasAttribute CLRName="ReSharperNoReorder"/> 
      </Match> 
</Pattern>

All should be well after that.