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Microsoft.Build.Tasks makefile generates assemblies with the version in the name. These files are copied to the class/lib/PROFILE directory without renaming them to remove the version, so that when unit tests are run the correct version of the assembly is not loaded and the 188.8.131.52 version is always loaded. This causes tests which require the 3.5 or 4.0 profile version to run to fail.
Msg: Using task Copy from Microsoft.Build.Tasks.Copy, Microsoft.Build.Tasks, Version=184.108.40.206, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Msg: Error executing task Copy: Task does not have property "OverwriteReadOnlyFiles" defined
Msg: Error executing task Copy: Microsoft.Build.BuildEngine.InvalidProjectFileException: Task does not have property "OverwriteReadOnlyFiles" defined
at Microsoft.Build.BuildEngine.TaskEngine.Prepare (ITask task, System.Xml.XmlElement taskElement, IDictionary`2 parameters, System.Type taskType) [0x00054] in /home/acearl/Projects/mono/mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/TaskEngine.cs:91
at Microsoft.Build.BuildEngine.BuildTask.Execute () [0x00081] in /home/acearl/Projects/mono/mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/BuildTask.cs:105
Tests run: 211, Failures: 1, Not run: 2, Time: 1.685 seconds
The issue isn't actually that the version is in the name, that is correct, the issue is that the tests don't use the correct version when building the test dll.
The issue was in the test...it was not setting ToolsVersion correctly.