text:   function testcase() 
    {
      var obj = {
        
      };
      Object.defineProperties(obj, {
        property : {
          configurable : new Boolean(true)
        }
      });
      var preCheck = obj.hasOwnProperty("property");
      delete obj.property;
      return preCheck && ! obj.hasOwnProperty("property");
    }
    {
      var __result1 = testcase();
      var __expect1 = true;
    }
    