feat: 소재 도시가 공백지여야하는 조건 작성

hwe/sammo/Constraint/NeutralCity.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace sammo\Constraint;
+
+class NeutralCity extends Constraint{
+    const REQ_VALUES = Constraint::REQ_CITY;
+
+    public function checkInputValues(bool $throwExeception=true):bool{
+        if(!parent::checkInputValues($throwExeception) && !$throwExeception){
+            return false;
+        }
+
+        if(!key_exists('nation', $this->city)){
+            if(!$throwExeception){return false; }
+            throw new \InvalidArgumentException("require nation in city");
+        }
+
+        return true;
+    }
+
+    public function test():bool{
+        $this->checkInputValues();
+        $this->tested = true;
+
+        if($this->city['nation'] == 0){
+            return true;
+        }
+
+        $this->reason = "공백지가 아닙니다.";
+        return false;
+    }
+}