public function testSetAllHeaders()
{
$msg = $this->getMockForAbstractClass('Amp\\Artax\\Message');
$msg->setAllHeaders(['My-Header1' => 'val1', 'My-Header2' => ['val1', 'val2']]);
$this->assertEquals(['val1'], $msg->getHeader('MY-HEADER1'));
$this->assertEquals(['val1', 'val2'], $msg->getHeader('MY-HEADER2'));
}