Playwright Validation Skill

This skill guides you through validating UI changes and ensuring comprehensive Playwright E2E test coverage.

When to Use

• After completing UI feature development
• Before creating a PR for UI changes
• When reviewing UI-related branches
• To verify existing Playwright tests cover all scenarios

Workflow

Phase 1: Review Branch Changes

1. Identify changed files vs main:

   git diff main --stat
   git diff main --name-only | grep -E "\.(tsx?|less|css|scss)$"

2. Focus on UI component changes:

   git diff main -- "openmetadata-ui/src/main/resources/ui/src/components/**" --stat

3. Check for existing Playwright tests:

   git diff main --name-only | grep -E "playwright.*\.spec\.ts$"

4. Read the changed component files to understand the UI modifications

Phase 2: Review Existing Playwright Tests

1. Locate relevant test files:

   • Check playwright/e2e/Pages/ for page-level tests
   • Check playwright/e2e/Features/ for feature-specific tests
   • Use Glob/Grep to find tests related to the feature

2. Analyze test coverage:

   • Read the existing test file(s)
   • Identify the test scenarios already covered
   • Note any gaps in coverage based on the UI changes

3. Review test utilities:

   • Check playwright/utils/ for helper functions
   • Check playwright/support/ for entity classes and fixtures

Phase 3: Validate with Playwright MCP

1. Start the browser and navigate:

   mcp__playwright__browser_navigate to http://localhost:8585

2. Authenticate if needed:

   • Use mcp__playwright__browser_fill_form for login
   • Default admin: admin@open-metadata.org / admin

3. Navigate to the feature area:

   • Use mcp__playwright__browser_click for navigation
   • Use mcp__playwright__browser_snapshot to inspect page state

4. Validate UI behavior:

   • Test the main user flows
   • Verify visual elements (icons, badges, labels)
   • Check interactive elements (buttons, dropdowns, forms)
   • Verify state changes and API calls

5. Document findings:

   • Note what works correctly
   • Identify any issues or missing functionality
   • List scenarios not covered by existing tests

Phase 4: Add Missing Test Cases

1. Create a TodoWrite checklist of missing test scenarios

2. For each missing test case:

   a. Add necessary test fixtures in beforeAll:

   • Create new entity instances (TableClass, DataProduct, etc.)
   • Set up required relationships (domains, assets)

   b. Add cleanup in afterAll:

   • Delete created entities in reverse order

   c. Write the test following the pattern:

   test('Descriptive Test Name - What it validates', async ({ page }) => {
     test.setTimeout(300000);
   
     await test.step('Step description', async () => {
       // Test actions and assertions
     });
   
     await test.step('Next step', async () => {
       // More actions and assertions
     });
   });

3. Test patterns to cover:

   • Happy path (expected behavior)
   • Edge cases (empty states, max values)
   • Error handling (invalid inputs, failed requests)
   • State transitions (before/after actions)
   • UI feedback (loading states, success/error messages)
   • Permissions (disabled buttons, restricted actions)

4. Run Playwright lint check:

   yarn lint:playwright

   Every playwright/* and om-playwright/* guardrail rule is error severity. Repo-wide openmetadata-playwright/* rules set their own, and may sit at warn while their call sites migrate — read the severity column in the handbook's ESLint Enforcement table rather than assuming.

Common Test Utilities

Navigation

import { sidebarClick } from '../../utils/sidebar';
import { redirectToHomePage } from '../../utils/common';
import { selectDataProduct, selectDomain } from '../../utils/domain';

Waiting

import { waitForAllLoadersToDisappear } from '../../utils/entity';
await waitForAllLoadersToDisappear(page);
await expect(page.getByTestId('content')).toBeVisible();
// NEVER use: page.waitForLoadState('networkidle') — blocked by ESLint

API Responses

const response = page.waitForResponse('/api/v1/endpoint*');
await someAction();
await response;
expect((await response).status()).toBe(200);

Assertions

await expect(page.getByTestId('element')).toBeVisible();
await expect(page.getByTestId('element')).toContainText('text');
await expect(page.locator('.class')).not.toBeVisible();

Checklist Before Completion

• All UI changes have corresponding test coverage
• Tests cover both positive and negative scenarios
• Tests verify visual indicators (icons, badges, states)
• Tests validate API interactions
• yarn lint:playwright passes with zero errors
• No networkidle, page.pause(), or test.only() usage (blocked by ESLint)
• Test fixtures are properly created and cleaned up
• Test timeouts use test.slow() (preferred) or test.setTimeout()

Example: Data Contract Inheritance Tests

For reference, see the comprehensive test coverage in:
playwright/e2e/Pages/DataContractInheritance.spec.ts

This file demonstrates:

• Multiple entity setup in beforeAll
• Domain assignment patches
• Contract creation and validation
• Inheritance icon verification
• Action button state verification (disabled/enabled)
• API response validation (POST vs PATCH)
• Fallback behavior testing