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mustRevalidate example

        if (null !== $entry
            && \in_array($response->getStatusCode(), [500, 502, 503, 504])
            && !$entry->headers->hasCacheControlDirective('no-cache')
            && !$entry->mustRevalidate()
        ) {
            if (null === $age = $entry->headers->getCacheControlDirective('stale-if-error')) {
                $age = $this->options['stale_if_error'];
            }

            /* * stale-if-error gives the (extra) time that the Response may be used *after* it has become stale. * So we compare the time the $entry has been sitting in the cache already with the * time it was fresh plus the allowed grace period. */
            if ($entry->getAge() <= $entry->getMaxAge() + $age) {

public function testIsCacheableWithSetTtl()
    {
        $response = new Response();
        $response->setTtl(10);
        $this->assertTrue($response->isCacheable());
    }

    public function testMustRevalidate()
    {
        $response = new Response();
        $this->assertFalse($response->mustRevalidate());
    }

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

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

    public function testMustRevalidateWithProxyRevalidateCacheControlHeader()
    {