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));
}