msbuild output remove assemblies - msbuild

Question

I have some msbuild code that looks something like this:
<Target Name="Build">
<MSBuild
Projects="#(UnitTestProject)"
Properties="$(BuildProperties)">
<Output TaskParameter="TargetOutputs" ItemName="TestAssembly" />
</MSBuild>
</Target>
<Target Name="Test" DependsOnTargets="Build">
<ItemGroup>
<TestAssembly Remove="*.Example.dll" />
</ItemGroup>
<xunit Assemblies="#(TestAssembly)" />
</Target>
So I am building all of my unit test projects and caputuring the built dll's using the Output task on the TargetOutputs parameter. The problem is that one of the projects is calling a task that outputs some dll's that I don't want to actually run xunit against.
What's weird though is that the Remove="*.Example.dll" appears to not have any affect at all and xunit is trying to test the assembly anyway.
Why is Remove not working?

Answer 1

Actually I think I figured it out. It appears that the problem resides in the way the relative path is resolved in ItemGroups in the Target vs. outside of a Target. I need to be a little more explicit with my path and then it works. Basically I did this to get it to work:
<Target Name="Build">
<MSBuild
Projects="#(UnitTestProject)"
Properties="$(BuildProperties)">
<Output TaskParameter="TargetOutputs" ItemName="UnitTestOutput" />
</MSBuild>
<ItemGroup>
<TestAssembly Include="#(UnitTestOutput)" Exclude="$(RootTestPath)\**\*.Example.dll" />
</Target>
<Target Name="Test" DependsOnTargets="Build">
<xunit Assemblies="#(TestAssembly)" />
</Target>