Including this file seems silly but is apparently required: http://bit.ly/1N2MimS

Author: Oren Novotny

xunit.runner.visualstudio.nuspec

@@ -39,5 +39,6 @@
     <file src="build\xunit.runner.visualstudio.uwp.targets"                                     target="build\uap10.0\xunit.runner.visualstudio.targets" />
     <file src="xunit.runner.visualstudio.uwp\bin\Release\xunit.runner.visualstudio.uwp.dll"     target="build\uap10.0\" />
     <file src="xunit.runner.visualstudio.uwp\bin\Release\xunit.runner.visualstudio.uwp.pri"     target="build\uap10.0\" />
+    <file src="xunit.runner.visualstudio.uwp\Properties\xunit.runner.visualstudio.uwp.rd.xml"   target="build\uap10.0\Properties\" />
   </files>
 </package>