/**
* @test
*/
public function getHeaderShouldReturnHeaderOrDefault()
{
$response = new Response();
$this->assertNull($response->getHeader('tussi'));
$this->assertSame('lussi', $response->getHeader('tussi', 'lussi'));
$response->setHeader('tussi', 'watussi');
$this->assertSame('watussi', $response->getHeader('tussi', 'lussi'));
}
