Provides a trait for use with the Drupal Test Traits library.
composer require --dev drupaltest/queue-runner-trait
class SampleTestWithQueueRunner extends ExistingSiteBase
{
    use QueueRunnerTrait;
    protected function tearDown()
    {
        // Empty a given queue after the test has finished.
        $this->clearQueue('my_queue_name');
    }
    public function testSomeQueue()
    {
        // Do something that adds an item to a queue.
        
        // Run the queue by name.
        $this->runQueue('my_queue_name');
    }
}See the included test for a detailed example.