$CI :
__construct()
Class Constructor
run_all()
Run all the available tests
test_get_setting()
test_get_setting_invalid_argument()
test_get_setting_that_does_not_exist()
test_set_setting_insert()
test_set_setting_update()
test_set_setting_invalid_setting_name()
test_remove_setting()
test_remove_setting_record_does_not_exist()
test_remove_setting_invalid_setting_name()