public function testWithoutHeaderThatDoesNotExist()
{
$response = new Response(200, ['Baz' => 'Bam']);
$response2 = $response->withoutHeader('foO');
$this->assertSame($response, $response2);
$this->assertFalse($response2->hasHeader('foo'));
$this->assertSame(['Baz' => ['Bam']], $response2->getHeaders());
}
