Http::withOptions('sink' => $path) has no effect with Http::fake

[lucaspottersky]

• Laravel Version: 7.14.1
• PHP Version: 7.4.6
• Database Driver & Version: N/A
• guzzlehttp/guzzle: 6.5.4

Description:

Trying to create a fake HTTP response that returns a file to Guzzle Http Client. The "sink" option seems to be ignored and no file is created at all.
The below test case fails.

Steps To Reproduce:

    function testFakes() {
        $filepath = __DIR__ . '/test-files/easy-txt.txt';
        $inDiskSize = filesize($filepath);

        $r = Http::response(
            file_get_contents($filepath),
            200,
            [
                'Content-Type' => 'text/plain; charset=UTF-8',
                'Content-Length' => $inDiskSize,
                'Content-Disposition' => 'attachment; filename="cool.html"'
            ]
        );
        Http::fake($r);

        $downloadLocation = '/tmp/downloaded_zip';
        $response = Http::withOptions(
            [
              // ▼▼▼ THE SINK OPTION SEEMS TO HAVE NO EFFECT. ▼▼▼
              RequestOptions::SINK => $downloadLocation
            ]
        )->get('http://foo/my.zip');

        Http::assertSentCount(1);

        // 💣💣💣 FAILS: filesize(): stat failed for /tmp/downloaded_zip
        $this->assertEquals($inDiskSize, filesize($downloadLocation));
    }

Related StackOverflow: https://stackoverflow.com/questions/62926381/laravel-fake-http-response-file-to-guzzle-http-client-sink-stream

[driesvints]

Seems like a feature request. Feel free to send in a PR if you want.