# Mock Ramsey\Uuid

## The mock method

```php
use Ramsey\Uuid\Generator\RandomGeneratorInterface;
use Ramsey\Uuid\Uuid;
use RuntimeException;
// ...

/**
 * Sets the expected responses from `Uuid::uuid4()`.
 *
 * @param string[] $uuids An array of string representations of Uuids
 */
protected function mockUuidValues(array $uuids)
{
    $uuidFactory = new \Ramsey\Uuid\UuidFactory();

    $uuidFactory->setRandomGenerator(new class($uuids) implements RandomGeneratorInterface
    {
        private $stack = [];

        public function __construct(array $uuids)
        {
            $this->stack = array_map(function ($uuid) {
                return Uuid::fromString($uuid)->getBytes();
            }, $uuids);
        }

        public function generate($length)
        {
            if (empty($this->stack)) {
                // throw new RuntimeException('The uuid stack is empty');

                return Uuid::fromString(sprintf(
                        '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
                        random_int(0, 65535),
                        random_int(0, 65535),
                        random_int(0, 65535),
                        random_int(0, 4095) | 0x4000,
                        random_int(0, 0x3fff) | 0x8000,
                        random_int(0, 65535),
                        random_int(0, 65535),
                        random_int(0, 65535)
                    ))->getBytes();
            }

            return array_shift($this->stack);
        }
    });

    \Ramsey\Uuid\Uuid::setFactory($uuidFactory);
}
```

### Usage

```php
$this->mockUuidValues([
    '3b2f5ae1-8be8-4738-a09b-e14a4c06fb8c',
    'ceb1d076-2bd8-40ac-8a37-86aa3903a486',
    '21fc39e0-28f3-4fb7-8ebe-35ceba715cfb',
]);

$value1 = Uuid::uuid4()->toString(); // 3b2f5ae1-8be8-4738-a09b-e14a4c06fb8c
$value2 = Uuid::uuid4()->toString(); // ceb1d076-2bd8-40ac-8a37-86aa3903a486
$value3 = Uuid::uuid4()->toString(); // 21fc39e0-28f3-4fb7-8ebe-35ceba715cfb
$value4 = Uuid::uuid4()->toString(); // RuntimeException The uuid stack is empty
```