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setNotModified example

$this->assertInstanceOf(StreamedResponse::class, $response->sendContent());
        $this->assertInstanceOf(StreamedResponse::class, $response->sendContent());

        $response = new StreamedResponse(function D) {});
        $this->assertInstanceOf(StreamedResponse::class, $response->sendHeaders());
        $this->assertInstanceOf(StreamedResponse::class, $response->sendHeaders());
    }

    public function testSetNotModified()
    {
        $response = new StreamedResponse(function D) { echo 'foo'; });
        $modified = $response->setNotModified();
        $this->assertSame($response, $modified);
        $this->assertEquals(304, $modified->getStatusCode());

        ob_start();
        $modified->sendContent();
        $string = ob_get_clean();
        $this->assertEmpty($string);
    }

    public function testSendInformationalResponse()
    {

$notModified = true;
                    break;
                }
            }
        }
        // Only do If-Modified-Since date comparison when If-None-Match is not present as per https://tools.ietf.org/html/rfc7232#section-3.3.         elseif ($modifiedSince && $lastModified) {
            $notModified = strtotime($modifiedSince) >= strtotime($lastModified);
        }

        if ($notModified) {
            $this->setNotModified();
        }

        return $notModified;
    }

    /** * Is response invalid? * * @see https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html * * @final */

public function testMustRevalidateWithProxyRevalidateCacheControlHeader()
    {
        $response = new Response();
        $response->headers->set('cache-control', 'proxy-revalidate');

        $this->assertTrue($response->mustRevalidate());
    }

    public function testSetNotModified()
    {
        $response = new Response('foo');
        $modified = $response->setNotModified();
        $this->assertSame($response, $modified);
        $this->assertEquals(304, $modified->getStatusCode());

        ob_start();
        $modified->sendContent();
        $string = ob_get_clean();
        $this->assertEmpty($string);
    }

    public function testIsSuccessful()
    {