tests: split queue-test testcases

All the test-cases are in one test atm. It doesn't matter for the
outcome, but when it is split to more tests, the debugging and reading
the output is simpler.

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>