Thanks for the info, Sam. I've written a function to return a list of Build Results and I'm able to get the buildContributionResults for each build result. Here's an example: 

I don't know 'exactly', but if you get the source for the
com.ibm.team.build.toolkit plugin
then look at the code in

com.ibm.team.build.internal.toolkit.unit

you will see how they create and view the unit test contributions,

to get the source, setup the sdk in eclipse, window->preferences, plugin development, target platform


then open the Plugin perspective, and find the plugin, then right click, import as source



then you can view the source in the eclipse project that matches the plugin name

Sam, I was able to get the JUnit Handles for each build result: 
IJUnitTestSuiteContributionHandle junitHandle = (IJUnitTestSuiteContributionHandle) junitContributionHandles[j].getExtendedContribution(); 

I haven't done anything with these types of objects..

as a debugging tool, you might print out the classname of the objects to see what type they are.