Add helper function to errors

error.go

@@ -58,3 +58,11 @@ func ErrorMessage(err error) string {
 	}
 	return INTERNAL_ERROR_MESSAGE
 }
+
+// Errorf is a helper function to return an Error with a given code and format
+func Errorf(code string, format string, args ...interface{}) *Error {
+	return &Error{
+		Code:    code,
+		Message: fmt.Sprintf(format, args...),
+	}
+}

error_test.go

@@ -49,7 +49,7 @@ func TestErrorMessage(t *testing.T) {
 	})
 
 	t.Run("should return application error message", func(t *testing.T) {
-		e := &Error{Message: "my_message"}
+		e := Errorf(ENOTFOUND, "Entity %s not found", "dirp")
 		got := ErrorMessage(e)
 
 		AssertErrorString(t, got, e.Message)