diff --git a/back_pwquality.sh b/back_pwquality.sh
index b52ad2c..a6d5d30 100644
--- a/back_pwquality.sh
+++ b/back_pwquality.sh
@@ -88,9 +88,13 @@ _mk_pwquality_conf() {
 				shift
 		;;
 			--usercheck) shift;
+				echo 1
 				_check_argument_is_number "$1" "--usercheck"
+				echo 2
 				[[ "$1" =~ (0|1) ]] || error $"The received parameters are not correct. Expected %s, received %s" $"0 or 1" "$1"
+				echo 3
 				usercheck="$1"
+				echo 4
 				shift
 		;;
 			--usersubstr) shift;
diff --git a/test_common.sh b/test_common.sh
index ccbe2bf..019ab06 100644
--- a/test_common.sh
+++ b/test_common.sh
@@ -6,13 +6,13 @@ TESTING=1
 
 . ./common.sh
 
-_check_argument_is_number 123 "this" || failed="$((++failed))"
+! _check_argument_is_number 123 "this" && failed="$((++failed))"
 _check_argument_is_number NotNumber "this" && failed="$((++failed))"
 
-_check_argument_value 8 7 "this" || failed="$((++failed))"
+! _check_argument_value 8 7 "this" && failed="$((++failed))"
 _check_argument_value 1 7 "this" && failed="$((++failed))"
 
-_check_argument_is_string "Hello" "this" || failed="$((++failed))"
+! _check_argument_is_string "Hello" "this" && failed="$((++failed))"
 _check_argument_is_string "Hello world" "this" && failed="$((++failed))"