assertEvent example

class OrderStateChangeEventListenerTest extends TestCase
{
    use IntegrationTestBehaviour;

    public function testTriggerTransactionEvents(): void
    {
        $ids = new TestDataCollection();

        $this->createCustomer($ids);
        $this->createOrder($ids);

        $this->assertEvent('state_leave.order_transaction.state.open');
        $this->assertEvent('state_enter.order_transaction.state.in_progress');

        $this->getContainer()
            ->get(StateMachineRegistry::class)
            ->transition(
                new Transition(
                    OrderTransactionDefinition::ENTITY_NAME,
                    $ids->get('transaction'),
                    StateMachineTransitionActions::ACTION_DO_PAY,
                    'stateId'
                ),