So Mono is proving to be a real pain, as per #1103 we now know that there is an issue with xunit2 under mono, and I have verified that this works using the latest mono nightly (4.3.0), our builds would be dependent on this release of mono containing fixes to get xunit2 working or we would need to run a nightly mono build on our agents.

Now that we are one step further along and tests can actually run against Mono 4.3.0, we are experiencing issues when running the Cluster and Remote tests that will need investigation.