จะเขียนโค้ด JavaScript Check Radio group เพื่อตรวจสอบค่าว่างยังไงครับ

<form method="post" action="" onsubmit="return test(this);" name="f1" id="f1">

<?php $arr=array(rand(0,100),rand(0,100),rand(0,100),rand(0,100),rand(0,100));?>

 <?php foreach(array_unique($arr) as $i):?>
    <hr /><?php echo $i;?> ???
    <input name="q<?php echo $i;?>" type="radio" value="5" >
    <input name="q<?php echo $i;?>" type="radio" value="4">
    <input name="q<?php echo $i;?>" type="radio" value="3">
    <input name="q<?php echo $i;?>" type="radio" value="2">
    <input name="q<?php echo $i;?>" type="radio" value="1">

    <?php endforeach;?>
 
<input type="submit" />
  
</form>