Playwright Testing for Event-Driven Architecture with Apache Kafka

This guide provides complete, production-ready Playwright patterns for playwright testing for event-driven architecture with apache kafka.

Introduction

Robust test automation requires domain-specific patterns. This article covers playwright testing for event-driven architecture with apache kafka with practical code examples you can use immediately in your test suite.

Architecture Overview

graph TD
    Test["Playwright Test"] --> App["Application Under Test"]
    App --> API["Backend API / Mock"]
    API --> Assert["Test Assertions Pass"]

Implementation

test('UI reflects Kafka event after processing', async ({ page }) => {
  // Publish a test event via API that triggers Kafka producer
  await page.request.post('/api/test/publish-event', {
    data: { type: 'ORDER_SHIPPED', orderId: 'ORD-123' }
  });

  await page.goto('/orders/ORD-123');
  // Wait for Kafka consumer to process and update UI
  await expect(page.getByTestId('order-status')).toContainText('Shipped', { timeout: 10000 });
});

Run Tests

npx playwright test --grep "Playwright Testing for"
npx playwright test --ui

Reference Table

Best Practices

Common Mistakes

Frequently Asked Questions

How do you test Kafka event-driven systems with Playwright?

Trigger events via a test API endpoint and verify the UI reflects the consumed event state.

How to handle Kafka consumer lag in tests?

Increase assertion timeout to accommodate consumer processing time (typically 5-10 seconds).

Can Playwright test event sourcing applications?

Yes, trigger commands via UI, verify events are produced, and assert the read model updates.

How to test idempotency in event processing?

Publish the same event twice via the test API and verify the UI only reflects one state change.

How to test Kafka dead letter queue handling?

Inject a malformed event and verify the UI shows an appropriate error state for failed processing.

Summary

This guide covered playwright testing for event-driven architecture with apache kafka. Apply these patterns to build reliable, fast, and maintainable automation for this specific scenario.

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