vendor/guzzlehttp/guzzle/src/Handler/MockHandler.php

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<?php

namespace GuzzleHttp\Handler;

use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Promise as P;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\TransferStats;
use GuzzleHttp\Utils;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\StreamInterface;

/**
 * Handler that returns responses or throw exceptions from a queue.
 *
 * @final
 */
class MockHandler implements \Countable
{
    /**
     * @var array
     */
    private $queue = [];

    /**
     * @var RequestInterface|null
     */
    private $lastRequest;

    /**
     * @var array
     */
    private $lastOptions = [];

    /**
     * @var callable|null
     */
    private $onFulfilled;

    /**
     * @var callable|null
     */
    private $onRejected;

    /**
     * Creates a new MockHandler that uses the default handler stack list of
     * middlewares.
     *
     * @param array|null    $queue       Array of responses, callables, or exceptions.
     * @param callable|null $onFulfilled Callback to invoke when the return value is fulfilled.
     * @param callable|null $onRejected  Callback to invoke when the return value is rejected.
     */
    public static function createWithMiddleware(array $queue = null, callable $onFulfilled = null, callable $onRejected = null): HandlerStack
    {
        return HandlerStack::create(new self($queue, $onFulfilled, $onRejected));
    }

    /**