On VSTS today, we can only report coverage for a single test run (that is, one of testSingleWorkspace, testMulitpleWorkspace, and testDebugger), for a single OS. No merging of the results is available out of the box, so that's where future effort will need to be spent.

There is a script that will merge cobertura reports (the format of coverage that VSTS needs) after the fact, so we can investigate that.

For a preview of what the code coverage will eventually look like, see this build against my personal repo. Look near the bottom of the summary page, then at the Code Coverage* and Logs tabs, in particular.