Fuel\Validation\Validator::getGlobalMessage PHP Method

    public function getGlobalMessage($ruleName)
    {
        if (!isset($this->messages[$ruleName])) {
            return null;
        }
        return $this->messages[$ruleName];
    }

 public function testGetSetGlobalMessage()
 {
     $message = 'Test message';
     $ruleName = 'test';
     $this->assertNull($this->object->getGlobalMessage($ruleName));
     $this->object->setGlobalMessage($ruleName, $message);
     $this->assertEquals($message, $this->object->getGlobalMessage($ruleName));
     $this->object->setGlobalMessage($ruleName, null);
     $this->assertNull($this->object->getGlobalMessage($ruleName));
 }