Bug 21450: Unit tests

Bug 21450: Unit tests

To test:
1 - Apply just this patch
2 - prove -v t/db_dependent/Linker_Default.t
3 - It fails
4 - Apply second patch
5 - prove -v t/db_dependent/Linker_Default.t
6 - It passes

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Bug 21450: Remove copyright lines

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 366ef794969c3bc67c70ea7c9d85cb04944f4f05)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>