This patch adds a unit test to test for an infinite loop as highlighted
by the bug.
Test plan
1/ Run the test before applying the fix
2/ The test should fail for 'Sundays'
3/ Apply the subsquent patch
4/ Re-run the test
5/ It should now pass
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com> Signed-off-by: Nick Clemens <nick@bywatersolutions.com> Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>