unittest problems for c++/cli via nunit in VS2008

Recently, my colleagues have some problems of running/debugging c++/cli nunit unittest in VS2008 via TestDriven and Resharper.

For TestDriven, dependent assemblies could not be loaded. For Resharper, VS2010 is fine, under VS2008, running testcases is ok, debugging them gets the error of 89710016 and the hosting process is not even started. After investigation, now find reasons and solutions.

Solutions:
1: Install testdriven.net, whose latest stable version is 3.0, then copy all dlls under
C:\Program Files (x86)\TestDriven.NET 3\NUnit\2.5\lib
to the upper folder. It seems to be testdriven.net’s privatePath setting problem.

2: Install resharper, open regeditor, goes to
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\9.0\AD7Metrics\Engine\{449EC4CC-30D2-4032-9256-EE18EB41B62B}
add a string entry:
CLRVersionForDebugging
value:
v2.0.50727

Now, the debugger can start, while the breakpoint is not active. Then, goes to
C:\Program Files (x86)\JetBrains\ReSharper\v6.1\Bin
open "JetBrains.ReSharper.TaskRunner.CLR4.exe.config"
change the <startup> section to below:

  <startup useLegacyV2RuntimeActivationPolicy="true">
    <requiredRuntime version="v2.0.50727" />
  </startup>

note: please make a copy of the .config file first.

Then, debugger and breakpoint work as expected.

It seems that VS2008 has some registry checking for the debugging extensions, not compatible with .net 4.0, and the external hosting process should also run with CLR 2.0 to successfully communicate with VS to support breakpoints.