assertRefundState example

static::assertJson($body);
        $content = json_decode($body, true, 512, \JSON_THROW_ON_ERROR);
        static::assertArrayHasKey('source', $content);
        static::assertSame([
            'url' => $this->shopUrl,
            'shopId' => $this->shopIdProvider->getShopId(),
            'appVersion' => '1.0.0',
        ], $content['source']);

        static::assertArrayHasKey('refund', $content);
        static::assertIsArray($content['refund']);
        $this->assertRefundState(OrderTransactionCaptureRefundStates::STATE_COMPLETED, $refundId);
    }

    public function testItFailsOnErrorResponse(): void
    {
        $paymentMethodId = $this->getPaymentMethodId('refundable');
        $orderId = $this->createOrder($paymentMethodId);
        $transactionId = $this->createTransaction($orderId, $paymentMethodId);
        $captureId = $this->createCapture($transactionId);
        $refundId = $this->createRefund($captureId);

        $salesChannelContext = $this->getSalesChannelContext($paymentMethodId);