Playwright Test Isolation Strategies for Reliable CI Pipelines

Design independent test suites with proper setup, teardown, and state isolation to eliminate flakiness and interdependency in Playwright CI runs. This guide provides step-by-step Playwright patterns to handle this scenario reliably.

Introduction

Robust automation requires handling domain-specific patterns effectively. This article covers playwright test isolation strategies for reliable ci pipelines with production-ready Playwright code.

Architecture Overview

graph TD
    Setup["beforeEach: Create user"] --> Test["Run Test"]
    Test --> Teardown["afterEach: Delete user"]
    Teardown --> Next["Next Test (fresh state)"]

Implementation Guide

test.describe('isolated user tests', () => {
  let userId: string;

  test.beforeEach(async ({ request }) => {
    // Create a fresh user before each test
    const response = await request.post('/api/users', {
      data: { email: test-${Date.now()}@test.com }
    });
    const user = await response.json();
    userId = user.id;
  });

  test.afterEach(async ({ request }) => {
    // Clean up after each test
    await request.delete(/api/users/${userId});
  });
});

Run Your Tests

npx playwright test --grep "Playwright Test Isolation"
npx playwright test --ui

Reference Table

Best Practices

Common Mistakes

Frequently Asked Questions

What causes test flakiness in Playwright?

Shared state, timing dependencies, hardcoded timeouts, and external service instability are common causes.

How to detect flaky tests in Playwright?

Use --repeat-each=5 to run tests multiple times and identify non-deterministic behavior.

Should each test create its own user?

Yes, creating unique test data per test ensures no interference between parallel workers.

How to isolate database state between tests?

Use database transactions that roll back after each test, or reset specific tables in beforeEach.

Can Playwright tests run in any order?

Tests should be independent and work in any order. Never assume previous test ran successfully.

Summary

Design independent test suites with proper setup, teardown, and state isolation to eliminate flakiness and interdependency in Playwright CI runs. Apply these patterns to build a reliable, maintainable automation suite for your specific use case.

Related Articles