This patch adds some unit tests for the new _get_sort_bin function.
We're testing that rules are applied in order and that the different
comparison operators work as expected.
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>