GuzzleHttp\Tests\PrepareBodyMiddlewareTest::testAddsContentLengthWhenMissingAndPossible PHP Метод

    public function testAddsContentLengthWhenMissingAndPossible()
    {
        $h = new MockHandler([function (RequestInterface $request) {
            $this->assertEquals(3, $request->getHeaderLine('Content-Length'));
            return new Response(200);
        }]);
        $m = Middleware::prepareBody();
        $stack = new HandlerStack($h);
        $stack->push($m);
        $comp = $stack->resolve();
        $p = $comp(new Request('PUT', 'http://www.google.com', [], '123'), []);
        $this->assertInstanceOf(PromiseInterface::class, $p);
        $response = $p->wait();
        $this->assertEquals(200, $response->getStatusCode());
    }