Commented Unassigned: Test load failed! Could not load file or assembly 'nunit.framework...' [11135]

I set the option in the btdfproj file:

<IncludeDeploymentTest>True</IncludeDeploymentTest>
<Platform Condition="'$(Platform)' == ''">Any CPU</Platform>

This includes a Verify Deployment option on the start menu. However, I get the 'Test load failed!' error. But, when I do the following changes on the shortcut:

Target: "E:\Program Files (x86)\B2B.Inbound for BizTalk\1.0.38\Deployment\Framework\DeployTools\NUnitSubset\nunit.exe" /run

Start in: "E:\Program Files (x86)\B2B.Inbound for BizTalk\1.0.38\Deployment\Framework\DeployTools\NUnitSubset"

It works. Or, maybe I'm doing something wrong. Please let me know. Thanks.
Comments: ** Comment from web user: defiestc **

I may have found a workaround. I modified the file RedistComponentGroup.xslt. According to the link
http://www.tfabraham.com/BTDFDocs/V5_5/CustomizingtheDefaultWiXTemplate.html,

I changed the following line:
from:
<xsl:attribute name="Arguments">&quot;[INSTALLDIR]$(var.DeploymentTest)&quot; /run</xsl:attribute>
to:
<xsl:attribute name="Arguments">/run</xsl:attribute>

And, I was able to build and do a Verify Deployment. Thanks.