How to run Visual Studio 2015 UnitTests without installing Visual Studio nor Test Agent

I have to run my VS2015 .NET Framework 4.6 based unit test dlls on a test computer that doesn't have VS2015 installed! it is also not allowed to install "Agents for Visual Studio 2015 Update 3" on the target computer!! The customer does not allow any installation nor modification to this computer! test dlls must be deployed in xcopy manner to this computer.

Is there an MSTest.exe equivalent tool that does not require installation?

I have tried to copy MSTest.exe and its dependencies on the target machine, MSTest.exe works but cannot run the tests because it lacks some Registry Keys that are created by the setup of "Agents for Visual Studio 2015 Update 3".

I can develop a small MSTest like tool that scans my assemblies for methods with the TestMethod attribute and simply executes them. I don't want to go this way cause it sounds like reinvention of the wheel.

Regards, Siraf