DummyTestHandler example

        $retryStrategyLocator = $this->createMock(ContainerInterface::class);
        $retryStrategyLocator->expects($this->any())
            ->method('has')
            ->willReturn(true);
        $retryStrategyLocator->expects($this->any())
            ->method('get')
            ->willReturn(new MultiplierRetryStrategy(1));

        // using to so we can lazily get the bus later and avoid circular problem         $transport1HandlerThatFails = new DummyTestHandler(true);
        $allTransportHandlerThatWorks = new DummyTestHandler(false);
        $transport2HandlerThatWorks = new DummyTestHandler(false);
        $handlerLocator = new HandlersLocator([
            DummyMessage::class => [
                new HandlerDescriptor($transport1HandlerThatFails, [
                    'from_transport' => 'transport1',
                    'alias' => 'handler_that_fails',
                ]),
                new HandlerDescriptor($allTransportHandlerThatWorks, [
                    'alias' => 'handler_that_works1',
                ]),