pytest-web

A lightweight local web UI for discovering, selecting, and running pytest suites — with real-time pass/fail status, filtering, env-var injection, and on-demand Allure reports.

Install

pip install pytest-web

Must be installed in the same Python environment as your project's pytest.

Quick start

cd your-project
pytest-web

Opens http://127.0.0.1:8000 in your browser automatically.

CLI flags

Features

Fetch & select tests

Click Fetch Tests (or press Enter in the path/args box) to collect all tests via pytest --collect-only. Tests are grouped by file. You can:

• Check/uncheck individual tests or entire files
• Use Select All to toggle only what's currently visible
• Type in the filter box to search by test name
• Click any counter (passed / failed / skipped) to filter to that status — click again to clear

Parameterized tests

Every @pytest.mark.parametrize variant is auto-expanded as a separate, individually selectable row (e.g. test_addition[1-2-3], test_addition[10-20-30], …) — no setup needed, since pytest-web uses pytest's own collection. You can run a single combination, a few, or all of them.

Run controls

• Workers — number of parallel workers (-n). Overrides any -n in pytest.ini addopts.
• ▶ Run Selected — runs only checked tests that are currently visible
• ■ Cancel — terminates the pytest process and all xdist workers cleanly

Param builder

Use the dropdown to add common pytest flags (-k, -m, --tb, -x, --maxfail, etc.) to the args bar without typing. Project-specific options from your conftest.py or installed plugins (e.g. --browser, --headed) are auto-detected and added to the dropdown.

Env vars

Inject environment variables for the test run. Type NAME=value in the Name field and it auto-splits on blur. Variables are saved to localStorage and restored on reload.

Live status

While tests run, each row shows a pulsing dot (running) that turns green/red/yellow on completion. The counters update in real time and accumulate across runs — so if you run a subset, the results from tests not in that run are preserved in the counters.

Output log

Pytest's stdout/stderr streams in a collapsible panel at the bottom. Opens automatically if stderr has output (e.g. failures). Shows all xdist worker output.

Command preview

The $ pytest ... command preview updates as you change selections, args, or workers. Click ⎘ to copy it.

Allure report (on demand)

If you use Allure for test reporting, pytest-web can generate and serve the Allure report with history tracking built in.

Requirements

Install the Allure CLI globally (separate from the Python package): https://allurereport.org/docs/v3/install/

Setup

Your project should have --alluredir in pytest.ini (or pyproject.toml):

# pytest.ini
[pytest]
addopts = --alluredir=test/allure-results --clean-alluredir

pytest-web auto-detects this path. You can also enter or override it manually in the Allure bar at the bottom of the page.

Usage

1. Run your tests (they populate the results directory)
2. Click Open Report in the Allure bar
3. The report is generated and served — your browser opens automatically
4. The URL is shown as a link in case the browser doesn't open

Click Stop to shut down the Allure server.

History / trends

Every time you click Open Report, pytest-web copies the history from the previous report back into the results directory before regenerating. This means Allure's trend graphs and history tabs work automatically — no manual setup required.

The report is written to allure-report/ next to your results directory (e.g. if results are in test/allure-results, the report is at test/allure-report).

Note: The Allure server is completely independent of the test runner. You can run tests while the Allure server is up, and vice versa.

How it works

1. Discover — pytest --collect-only -p pytest_web.plugin writes collected node IDs to a temp file and returns them to the UI.
2. Run — pytest <selected-ids> -n <workers> -p pytest_web.plugin is launched as a subprocess. The plugin fires HTTP webhooks back to the FastAPI server at each test start/end.
3. Stream — the server broadcasts those events over WebSocket to all connected browser tabs. The UI updates each row's status dot and counters in real time.
4. Allure — allure generate builds the HTML report (with history), then allure open serves it on a separate port.

Your pytest.ini, conftest.py, fixtures, and plugins are all used normally — pytest-web just wraps the command.

Compatibility

• Python 3.9 – 3.13
• pytest 7+
• pytest-xdist 3+ (installed automatically as a dependency)
• Works with any pytest plugin (playwright, django, anyio, etc.)