This patch adds unit tests of the CalcDueDate function to ensure that
the useDaysMode "Dayweek" mode works as expected
Sponsored-by: Cheshire West and Chester Council
Sponsored-by: Cheshire East Council
Sponsored-by: Newcastle City Council
Sponsored-by: Sefton Council
Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
