BizTalk testing maps with multiple xml input or is this a C # Inline issue?

Can someone explain how to get the multi-input BizTalk cards unit tests to work?

I happily used the examples on the Michael Stephenson blog to test my maps, but I just tried my first multiple input maps and it doesn't work :-(

I used the VS2005 "test card" to first instantiate an input with two input messages and then use flavors of that file as test inputs ...

<ns0:Root xmlns:ns0="http://schemas.microsoft.com/BizTalk/2003/aggschema">
  <InputMessagePart_0>
    ...
  </InputMessagePart_0>
  <InputMessagePart_1>
    ...
  </InputMessagePart_1>
</ns0:Root>

      

        
        
        
      

    

These test messages generate the expected output when I use the VS testcard, but the section is missing when trying to unit tests.

The only thing I can think of is the map has some functoids in ... Scripting, Table Screen and Table Loop ...

unit test calls StreamingTransform.ScalableTransform ...

// This is the BizTalk Server 2006 way of calling 
mapInstance.StreamingTransform.Transform(inputStream, 
    mapInstance.TransformArgs, outputStream, resolver);
// This is the R2 way of calling
XmlReader xmlRdr = new XmlTextReader(inputStream);
mapInstance.StreamingTransform.ScalableTransform(xmlRdr, 
    mapInstance.TransformArgs, outputStream, 
    resolver, whitespaceCorrect);

      

        
        
        
      

    

and the alternative approach to using Transform.Transform doesn't work either ...

XPathDocument doc = new XPathDocument(inputStream);
mapInstance.Transform.Transform(doc, mapInstance.TransformArgs, outputStream);