refactor errors

core/test_helper.go

@@ -9,9 +9,9 @@ import (
 func SelectKeyByAttrIdx(interfaceUser []int, passcodeIdxs []int, keypadSize KeypadDimension) ([]int, error) {
 	selectedKeys := make([]int, len(passcodeIdxs))
 	for idx := range passcodeIdxs {
-		attrIdx := util.IndexOf[int](interfaceUser, passcodeIdxs[idx])
-		if attrIdx == -1 {
-			return nil, errors.New(fmt.Sprintf("index: %d out of range 0-%d", passcodeIdxs[idx], keypadSize.TotalAttrs()-1))
+		attrIdx, err := util.IndexOf[int](interfaceUser, passcodeIdxs[idx])
+		if err != nil {
+			return nil, err
 		}
 		keyNumb := attrIdx / keypadSize.AttrsPerKey
 		if keyNumb >= keypadSize.NumbOfKeys {