QA Playwright Py Writer

QA Playwright Python Writer

Purpose

Write Playwright E2E tests for Python from test case specifications. Transform structured test cases into executable Playwright Python test files with pytest-playwright, Page Object Model, auto-waiting, multi-browser support, and optional live browser record mode.

Trigger Phrases

• "Write Playwright Python tests for [feature/flow]"
• "Generate Playwright E2E tests in Python"
• "Create pytest-playwright tests"
• "Add Playwright tests with record mode (Python)"
• "Playwright Python tests for [URL/flow]"
• "POM-based Playwright tests in Python"
• "pytest-playwright tests for [page]"
• "Heal my failing Playwright Python tests"

Three Modes

Key Features

Workflow

1. Read test cases — From specs, requirements, or manual test designs
2. Analyze app — Inspect pages, flows, selectors (or use Record Mode)
3. Generate tests — Produce test_{feature}.py with POM where appropriate
4. Configure — Add/update conftest.py, pytest.ini or pyproject.toml
5. Run — User runs pytest to execute tests

E2E Testing

• Navigation: page.goto(), page.go_back(), page.reload()
• Interactions: click(), fill(), select_option(), check(), hover(), press()
• Assertions: expect(locator).to_be_visible(), to_have_text(), to_have_url(), etc.
• Network: page.route() for API mocking, request/response interception
• Auto-wait: Playwright auto-waits; avoid page.wait_for_timeout()

See references/patterns.md for navigation, forms, auth, file upload, drag-drop, iframes, multi-tab, API mocking, visual comparison.

Page Object Model (POM)

• Base page: Shared selectors, navigation helpers, common actions
• Page-specific: Extend base; encapsulate page-specific locators and methods
• Component objects: Reusable components (header, modal, form) as classes

See references/best-practices.md for POM structure.

Key Patterns

• Structure: def test_*() functions; pytest.mark for grouping; conftest.py for fixtures
• Locators: get_by_role > get_by_test_id > get_by_text > get_by_label > CSS selector
• Assertions: expect(locator).to_be_visible(), to_have_text(), to_have_url(), to_have_count(), etc.
• Network: page.route(url, handler) for mocking; page.unroute() to clear
• Fixtures: page, browser, context, playwright from pytest-playwright; custom fixtures in conftest.py

See references/patterns.md for full pattern reference.

Locator Priority

1. get_by_role — Accessibility-based; most resilient
2. get_by_test_id — data-testid; explicit, stable
3. get_by_text — Visible text; use for unique labels
4. get_by_label — Form labels; good for inputs
5. CSS selector — Last resort; brittle for dynamic content

File Naming

• Tests: test_{feature}.py (e.g., test_login.py, test_checkout.py)
• Fixtures: conftest.py in test directory or package root
• Page objects: pages/ or page_objects/ directory

Configuration

• pytest.ini / pyproject.toml — pytest options, markers, playwright settings
• conftest.py — Shared fixtures, base URL, browser options
• pytest-playwright — Provides page, browser, context fixtures

See references/config.md for full config guide.

MCP Integration

• Context7 MCP — Fetch Playwright Python documentation when needed
• Playwright MCP (cursor-ide-browser, @playwright/mcp) — Record mode: navigate, snapshot, click, type; capture interactions → generate Python test code

Scope

Can do (autonomous):

• Generate Playwright E2E tests in Python from test case specs
• Use Record Mode with Playwright MCP to capture and generate tests
• Apply POM pattern, stable locators, auto-wait
• Configure conftest.py, pytest.ini, pyproject.toml for pytest-playwright
• Use page.route() for API mocking
• Delegate to qa-test-healer when tests fail (Heal Mode)
• Use Context7 MCP for Playwright Python docs

Cannot do (requires confirmation):

• Change production code structure
• Add dependencies not in requirements.txt / pyproject.toml
• Override project pytest/playwright config without approval
• Navigate to URLs not provided (Record Mode)

Will not do (out of scope):

• Execute tests (user runs pytest)
• Write pytest unit tests without Playwright (use qa-pytest-writer)
• Modify CI/CD pipelines
• Bypass security or access restricted areas

References

• references/patterns.md — Sync vs async, pytest fixtures, POM, network mocking
• references/config.md — pytest-playwright, conftest.py, pytest.ini, browser config
• references/best-practices.md — POM, locators, async patterns, test isolation

Quality Checklist

• Auto-wait used; no page.wait_for_timeout (use expect with timeout or wait_for)
• No hardcoded waits; prefer expect auto-retry
• POM pattern applied for page-specific logic
• Stable locators (get_by_role, get_by_test_id preferred)
• Tests independent (no shared state, order-independent)
• Proper teardown (fixtures, conftest if needed)
• Traceability to test case IDs where applicable
• No hardcoded secrets (use env vars)

Troubleshooting