Can not reference TestRunnerACAD dll directly

[leaveblackgithub]

I just found that although I seperate the example tests from TestRunnerACAD, referencing TestRunnerACAD dll directly will cause exceptions as following. I can not fix it. The example tests can only work with referencing to TestRunnerACAD project.
Exception thrown: 'Autodesk.AutoCAD.Runtime.Exception' in acdbmgd.dll
Exception thrown: 'System.Reflection.TargetInvocationException' in mscorlib.dll
Exception thrown: 'NUnit.Framework.Internal.NUnitException' in nunit.framework.dll
Exception thrown: 'NUnit.Framework.AssertionException' in nunit.framework.dll
Exception thrown: 'System.Reflection.TargetInvocationException' in mscorlib.dll
Exception thrown: 'NUnit.Framework.Internal.NUnitException' in nunit.framework.dll
Exception thrown: 'NUnit.Framework.SuccessException' in nunit.framework.dll
Exception thrown: 'System.Reflection.TargetInvocationException' in mscorlib.dll
Exception thrown: 'NUnit.Framework.Internal.NUnitException' in nunit.framework.dll
Exception thrown: 'Autodesk.AutoCAD.Runtime.Exception' in acdbmgd.dll
The thread 0x4fb8 has exited with code 0 (0x0).
The thread 0x850 has exited with code 0 (0x0).
The thread 0x6814 has exited with code 0 (0x0).
'accoreconsole.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll'.
Exception thrown: 'System.Reflection.TargetInvocationException' in mscorlib.dll
Exception thrown: 'NUnit.Framework.Internal.NUnitException' in nunit.framework.dll
Exception thrown: 'NUnit.Framework.AssertionException' in nunit.framework.dll
Exception thrown: 'System.Reflection.TargetInvocationException' in mscorlib.dll
Exception thrown: 'NUnit.Framework.Internal.NUnitException' in nunit.framework.dll
Exception thrown: 'NUnit.Framework.SuccessException' in nunit.framework.dll
Exception thrown: 'System.Reflection.TargetInvocationException' in mscorlib.dll
Exception thrown: 'NUnit.Framework.Internal.NUnitException' in nunit.framework.dll
The thread 0x6608 has exited with code 0 (0x0).
The thread 0x3298 has exited with code 0 (0x0).
The thread 0x51fc has exited with code 0 (0x0).
Exception thrown: 'System.ComponentModel.Win32Exception' in System.dll
The program '[24364] accoreconsole.exe' has exited with code 0 (0x0).