BusinessLink-specific TNA link test

I created a test specifically for the BusinessLink URLs and the issue with TNA replacing the location and redirecting to a 404.

However, it wouldn't be too much work to make this test accept a parameter of the TNA timestamp and be able to be run for all of the existing mappings, hence the pull request.

I thought there was a story for testing the TNA links but I can't find one, so no story reference (sorry Brad).