/**
* @group ZF-5209
*/
public function testCheckingHasHeaderFunctionality()
{
$message = new Message(array('headers' => array('subject' => 'foo')));
$this->assertTrue($message->headerExists('subject'));
$this->assertTrue(isset($message->subject));
$this->assertTrue($message->headerExists('SuBject'));
$this->assertTrue(isset($message->suBjeCt));
$this->assertFalse($message->headerExists('From'));
}