public function testSetNotModified() {
$response = new Response();
$modified = $response
->setNotModified();
$this
->assertObjectHasAttribute('headers', $modified);
$this
->assertObjectHasAttribute('content', $modified);
$this
->assertObjectHasAttribute('version', $modified);
$this
->assertObjectHasAttribute('statusCode', $modified);
$this
->assertObjectHasAttribute('statusText', $modified);
$this
->assertObjectHasAttribute('charset', $modified);
$this
->assertEquals(304, $modified
->getStatusCode());
}