Cellenium Playwright

Cellenium Playwright is an experimental Python browser-automation toolkit built on Playwright. It provides browser lifecycle management, a Google-Sheets-backed Page Object Model (POM), screenshot capture, and components for structured visual analysis with CrewAI.

The repository also contains TestFlow, a set of Claude Code skills that turns product requirements and technical specifications into traceable pytest tests, validated UI locators, execution evidence, and a test-quality verdict.

Status: active development. The browser and locator layers are usable, but the checked-in vision test is still a scaffold and does not currently pass. Install it from PyPI with pip install cellenium (or uv add cellenium), then run playwright install chromium. Configuration (.env, credentials.json) is read from your project's working directory.

Features

• Synchronous Chromium, Firefox, or WebKit sessions through Playwright.
• Reusable PageEngine helpers for navigation, locators, screenshots, scrolling, dropdowns, and tabs.
• Page Object Model data read directly from Google Sheets at runtime.
• Locator strategies for name, XPath, ID, CSS, class name, link text, and tag name.
• Structured image-analysis components built with CrewAI and Pydantic.
• Parallel pytest execution in CI on Python 3.13 and 3.14.
• Optional TestFlow skills for end-to-end pytest test generation and evaluation.

Requirements

• Python 3.13 or 3.14
• uv
• A Playwright-supported browser
• A Google service account for resolving locators
• An OpenAI-compatible model and API key when using the vision components

Quick start

Clone the repository and install the locked dependencies:

git clone https://github.com/MedviJenka/cellenium-playwright.git
cd cellenium-playwright
uv sync --frozen

Install Chromium:

uv run playwright install chromium

On Ubuntu or another Debian-based CI runner, install Chromium and its system dependencies together:

uv run playwright install --with-deps chromium

Configuration

In the project where you use cellenium, run:

cellenium init     # writes a .env template, adds .env and credentials.json to .gitignore, installs Chromium and the Claude Code commands
cellenium claude   # (re)installs the /cellenium:* Claude Code commands and skills into .claude/
cellenium doctor   # checks settings, credentials.json, Google Sheet access, and that Chromium launches

cellenium init --with-deps also installs Chromium's system libraries (Linux/CI). cellenium doctor --offline skips opening the sheet; it exits non-zero when a check fails, so it can gate CI.

cellenium claude --global installs the commands into ~/.claude so they are available in every project; locally modified files are kept unless you pass --force. Restart Claude Code after installing. cellenium init --skip-claude skips this step.

Settings are read from .env in the working directory or from environment variables:

GOOGLE_SHEETS=<spreadsheet-edit-url>
CREDENTIALS_JSON=credentials.json
OPENAI_MODEL=<model-name>
OPENAI_API_KEY=<optional-api-key>
LOGFIRE_TOKEN=<optional-logfire-token>
TEST_HEADLESS=true

GOOGLE_SHEETS selects the locator spreadsheet. When LOGFIRE_TOKEN is omitted, logging remains local and no data is sent to Logfire.

Save the Google service-account key as credentials.json and share the locator spreadsheet with its client_email as a viewer (cellenium doctor prints the address). Never commit .env or credentials.json.

Google Sheets Page Object Model

Each worksheet tab represents one screen. The first row must contain these columns:

Example worksheet:

PageEngine(screen="Google") reads locator rows directly from the worksheet tab named Google. No generated JSON mapping or synchronization step is required.

Browser automation

from src.core.engine.page_engine import PageEngine

engine = PageEngine(screen="Google", headless=True)

try:
    engine.get_web("https://www.google.com")
    engine.get_element("search").fill("cats")
    engine.get_element("button").click()
    screenshot = engine.get_screenshot("google-results")
    print(screenshot)
finally:
    engine.teardown()

screen="Google" selects the worksheet tab named Google. With multiple tabs, pass the page's tab name when constructing PageEngine (for example, Google, Heroku, or ST). Missing worksheets, missing element names, and unsupported locator strategies raise explicit exceptions.

Tests and linting

Run the test suite:

uv run --frozen pytest src/tests tests -v -n auto --dist loadscope

src/tests/test_google_search.py exercises the live browser flow. The unit regressions in tests/ cover screenshot persistence and direct worksheet selection without contacting external services.

Run the blocking CI lint checks:

uvx --from flake8==7.4.1 flake8 main.py settings.py src \
  --count --select=E9,F63,F7,F82 --show-source --statistics

The GitHub Actions workflow in .github/workflows/python-package.yml performs locked dependency installation, installs Chromium, runs lint checks, and executes the tests under Xvfb for Python 3.13 and 3.14.

TestFlow Claude Code skills

TestFlow separates pytest creation into focused stages:

PRD → test specification → UI locators → pytest writer → executor → evaluator

artifact orchestrates the complete pipeline and repeats only the affected downstream stages when evaluation finds a defect.

web is a report-only exploratory entry point. Verified findings become regression candidates for test-spec; it does not modify application code.

Validate the Claude Code plugin metadata:

claude plugin validate .

Run Claude Code from the repository and invoke either the complete pipeline or an individual stage:

/cellenium:web
/cellenium:artifact
/cellenium:prd-reader
/cellenium:test-spec
/cellenium:locator-writer
/cellenium:writer
/cellenium:executor
/cellenium:evaluator

The skills are manual-only. The locator writer previews changes before replacing existing Google Sheet selectors and verifies selectors against the live UI.

The separate checklist skills live under .claude/skills/checklist/: before-startup (system ready to build tests), cruising (everything in place, critical errors and potential bugs), landing (final production readiness), and the standalone fordec emergency decision skill.

Project layout

.github/workflows/               GitHub Actions CI
.claude/skills/cellenium/        Pytest TestFlow skill definitions
.claude/skills/checklist/        Checklist skills (before-startup, cruising, landing, fordec)
.claude/commands/cellenium/      TestFlow slash-command entries
.claude-plugin/plugin.json       Claude Code plugin metadata
src/core/engine/                 Playwright browser and page engines
src/core/functions/              Locator resolution and direct Google Sheets access
src/core/ai/                     CrewAI configuration and vision components
src/tests/                       Browser test scenarios
settings.py                      Environment-backed runtime configuration
pyproject.toml                   Python requirements and dependencies
uv.lock                          Reproducible dependency lockfile

Known limitations

• The checked-in vision test uses a placeholder VisionAssertion without a run() implementation.
• The sample end-to-end test depends on Google and is not hermetic.
• Configuration currently requires fields that are reserved but not consumed by every component.
• The project does not yet define a wheel/sdist build or publishing workflow.

License

Licensed under the ISC License. Copyright © 2026 Jenia Petrusenko.