sendValidRequest example

$this->catchEvent(OrderPaymentMethodChangedEvent::class, $this->paymentMethodChangedEventResult);

        $this->paymentMethodChangedCriteriaEventResult = null;
        $this->catchEvent(OrderPaymentMethodChangedCriteriaEvent::class, $this->paymentMethodChangedCriteriaEventResult);

        $this->transactionStateEventResult = null;
        $this->catchEvent(StateMachineTransitionEvent::class, $this->transactionStateEventResult);
    }

    public function testSetPaymentMethodOwnOrderOtherPaymentMethodOpen(): void
    {
        $this->sendValidRequest($this->ids->get('order-1'), $this->getAvailablePaymentMethodId(1));
        $transactions = $this->getTransactions($this->ids->get('order-1'));
        static::assertCount(2, $transactions);
        $firstTransaction = $transactions->first();
        static::assertNotNull($firstTransaction);
        $lastTransaction = $transactions->last();
        static::assertNotNull($lastTransaction);
        static::assertNotSame($firstTransaction->getId(), $lastTransaction->getId());

        static::assertNotNull($firstTransaction->getStateMachineState());
        static::assertNotNull($lastTransaction->getStateMachineState());
        static::assertSame('cancelled', $firstTransaction->getStateMachineState()->getTechnicalName());