PhlyTest\Http\ServerTest::testListenPassesCallableArgumentToCallback PHP Method

    public function testListenPassesCallableArgumentToCallback()
    {
        $phpunit = $this;
        $invoked = false;
        $request = $this->request;
        $response = $this->response;
        $this->response->expects($this->once())->method('getHeaders')->will($this->returnValue([]));
        $final = function ($req, $res, $err = null) use($phpunit, $request, $response, &$invoked) {
            $phpunit->assertSame($request, $req);
            $phpunit->assertSame($response, $res);
            $invoked = true;
        };
        $callback = function ($req, $res, callable $final = null) use($phpunit) {
            if (!$final) {
                $phpunit->fail('No final callable passed!');
            }
            $final($req, $res);
        };
        $server = Server::createServerFromRequest($callback, $this->request, $this->response);
        $server->listen($final);
        ob_end_flush();
        $this->assertTrue($invoked);
    }