Add signal testing of all variables
this commit contains all qPref* that work directly
followup commit will do changes to qPref* to make signals work
Signed-off-by: Jan Iversen <jani@apache.org>
make next_check (in qPrefUpdateManager) long instead of string
Correct test cases (compare time_t not strings)
Add test case to check time_t works as expected
Signed-off-by: Jan Iversen <jani@apache.org>