* Martin Pitt <mpitt@debian.org>, 2014-02-27, 17:38:
Tests can now depend on "@builddeps@" which expands to the source package's build dependencies. This is useful if you have many build dependencies which are only necessary for running the test suite and you don't want to replicate them in the test Depends:.
I advise to never use @builddeps@. It's a great way to shoot yourself in the foot. :\
-- Jakub Wilk