[givehimagun]

I'd love to know if their integration tests use a database or reference external services of any sort.

We ended up making a compromise where each test can never expect another test to have run...but some tests expect certain test data to be present and in a known state. To handle that, every test cleans up the data of the previous run (Entity Framework has a nice change tracker where we can keep track of the unit of work before it is persisted). We wouldn't be able to parallelize everything though...we can only accept a single test to be active on the DB at a single point in time.