docs/developer_docs/testing/e2e-testing.md

---
title: End-to-End Testing
sidebar_position: 4
---

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# End-to-End Testing

Apache Superset uses Playwright for end-to-end testing, migrating from the legacy Cypress tests.

## Running Tests

### Playwright (Recommended)

```bash
cd superset-frontend

# Run all tests
npm run playwright:test
# or: npx playwright test

# Run specific test file
npx playwright test tests/auth/login.spec.ts

# Run with UI mode for debugging
npm run playwright:ui
# or: npx playwright test --ui

# Run in headed mode (see browser)
npm run playwright:headed
# or: npx playwright test --headed

# Debug specific test file
npm run playwright:debug tests/auth/login.spec.ts
# or: npx playwright test --debug tests/auth/login.spec.ts
```

### Cypress (Deprecated)

Cypress tests are being migrated to Playwright. For legacy tests:

```bash
cd superset-frontend/cypress-base
npm run cypress-run-chrome    # Headless
npm run cypress-debug         # Interactive UI
```

## Project Architecture

```
superset-frontend/playwright/
├── components/core/     # Reusable UI components
├── pages/              # Page Object Models
├── tests/              # Test files organized by feature
├── utils/              # Shared constants and utilities
└── playwright.config.ts
```

## Design Principles

We follow **YAGNI** (You Aren't Gonna Need It), **DRY** (Don't Repeat Yourself), and **KISS** (Keep It Simple, Stupid) principles:

- Build only what's needed now
- Reuse existing patterns and components
- Keep solutions simple and maintainable

## Page Object Pattern

Each page object encapsulates:

- **Actions**: What you can do on the page
- **Queries**: Information you can get from the page
- **Selectors**: Centralized in private static SELECTORS constant
- **NO Assertions**: Keep assertions in test files

**Example Page Object:**

```typescript
export class AuthPage {
  // Selectors centralized in the page object
  private static readonly SELECTORS = {
    LOGIN_FORM: '[data-test="login-form"]',
    USERNAME_INPUT: '[data-test="username-input"]',
  } as const;

  // Actions - what you can do
  async loginWithCredentials(username: string, password: string) {}

  // Queries - information you can get
  async getCurrentUrl(): Promise<string> {}

  // NO assertions - those belong in tests
}
```

**Example Test:**

```typescript
import { test, expect } from '@playwright/test';
import { AuthPage } from '../../pages/AuthPage';
import { LOGIN } from '../../utils/urls';

test('should login with correct credentials', async ({ page }) => {
  const authPage = new AuthPage(page);
  await authPage.goto();
  await authPage.loginWithCredentials('admin', 'general');

  // Assertions belong in tests, not page objects
  expect(await authPage.getCurrentUrl()).not.toContain(LOGIN);
});
```

## Core Components

Reusable UI interaction classes for common elements (`components/core/`):

- **Form**: Container with properly scoped child element access
- **Input**: Supports `fill()`, `type()`, and `pressSequentially()` methods
- **Button**: Standard click, hover, focus interactions

**Usage Example:**

```typescript
import { Form } from '../components/core';

const loginForm = new Form(page, '[data-test="login-form"]');
const usernameInput = loginForm.getInput('[data-test="username-input"]');
await usernameInput.fill('admin');
```

## Test Reports

Playwright generates multiple reports for better visibility:

```bash
# View interactive HTML report (opens automatically on failure)
npm run playwright:report
# or: npx playwright show-report

# View test trace for debugging failures
npx playwright show-trace test-results/[test-name]/trace.zip
```

### Report Types

- **List Reporter**: Shows progress and summary table in terminal
- **HTML Report**: Interactive web interface with screenshots, videos, and traces
- **JSON Report**: Machine-readable format in `test-results/results.json`
- **GitHub Actions**: Annotations in CI for failed tests

### Debugging Failed Tests

When tests fail, Playwright automatically captures:

- **Screenshots** at the point of failure
- **Videos** of the entire test run
- **Traces** with timeline and network activity
- **Error context** with detailed debugging information

All debugging artifacts are available in the HTML report for easy analysis.

## Configuration

- **Config**: `playwright.config.ts` - matches Cypress settings
- **Base URL**: `http://localhost:8088` (assumes Superset running)
- **Browsers**: Chrome only for Phase 1 (YAGNI)
- **Retries**: 2 in CI, 0 locally (matches Cypress)

## Contributing Guidelines

### Adding New Tests

1. **Check existing components** before creating new ones
2. **Use page objects** for page interactions
3. **Keep assertions in tests**, not page objects
4. **Follow naming conventions**: `feature.spec.ts`

### Adding New Components

1. **Follow YAGNI**: Only build what's immediately needed
2. **Use Locator-based scoping** for proper element isolation
3. **Support both string selectors and Locator objects** via constructor overloads
4. **Add to `components/core/index.ts`** for easy importing

### Adding New Page Objects

1. **Centralize selectors** in private static SELECTORS constant
2. **Import shared constants** from `utils/urls.ts`
3. **Actions and queries only** - no assertions
4. **Use existing components** for DOM interactions

## Migration from Cypress

When porting Cypress tests:

1. **Port the logic**, not the implementation
2. **Use page objects** instead of inline selectors
3. **Replace `cy.intercept/cy.wait`** with `page.waitForRequest()`
4. **Use shared constants** from `utils/urls.ts`
5. **Follow the established patterns** shown in `tests/auth/login.spec.ts`

## Best Practices

- **Centralize selectors** in page objects
- **Centralize URLs** in `utils/urls.ts`
- **Use meaningful test descriptions**
- **Keep page objects action-focused**
- **Put assertions in tests, not page objects**
- **Follow the existing patterns** for consistency