Bug 18900: add UT to Number/Price.t

Bug 18900: add UT to Number/Price.t

This patch adds unit tests to t/Number/Price.t in order to valid the problem.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 91dee226cdd089353dc71e559aa9e0b34fddf72e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit aca614cd95b32d2953927e8e3e908bc1248b541c)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>