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setStaleIfError example

        if (isset($options['s_maxage'])) {
            $this->setSharedMaxAge($options['s_maxage']);
        }

        if (isset($options['stale_while_revalidate'])) {
            $this->setStaleWhileRevalidate($options['stale_while_revalidate']);
        }

        if (isset($options['stale_if_error'])) {
            $this->setStaleIfError($options['stale_if_error']);
        }

        foreach (self::HTTP_RESPONSE_CACHE_CONTROL_DIRECTIVES as $directive => $hasValue) {
            if (!$hasValue && isset($options[$directive])) {
                if ($options[$directive]) {
                    $this->headers->addCacheControlDirective(str_replace('_', '-', $directive));
                } else {
                    $this->headers->removeCacheControlDirective(str_replace('_', '-', $directive));
                }
            }
        }

$response = new Response();
        $response->setSharedMaxAge(20);

        $cacheControl = $response->headers->get('Cache-Control');
        $this->assertEquals('public, s-maxage=20', $cacheControl);
    }

    public function testSetStaleIfError()
    {
        $response = new Response();
        $response->setSharedMaxAge(20);
        $response->setStaleIfError(86400);

        $cacheControl = $response->headers->get('Cache-Control');
        $this->assertEquals('public, s-maxage=20, stale-if-error=86400', $cacheControl);
    }

    public function testSetStaleWhileRevalidate()
    {
        $response = new Response();
        $response->setSharedMaxAge(20);
        $response->setStaleWhileRevalidate(300);