This commit adds a set of unit tests for the new methods in Koha::MarcOrder
The two controller functions at the start of the file have not been included as they simply call the functions in these tests
The _stage_file method is also not included as this is a copy of the existing file staging code with the background job functionality removed
Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov> Signed-off-by: Nick Clemens <nick@bywatersolutions.com> Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>