pytest-mergify
Pytest plugin for Mergify Test Insights.
More information at https://mergify.com
Features
- Test tracing — Sends OpenTelemetry traces for every test to Mergify's API
- Flaky test detection — Intelligently reruns tests to detect flakiness with budget constraints
- Test quarantine — Quarantines failing tests so they don't block CI
- Test selection — Runs only the previously-failing tests when Mergify's merge queue reruns a job
Installation
Install the package alongside pytest (>= 6.0.0):
pip install pytest-mergify
The plugin is auto-discovered by pytest — no manual registration required.
Configuration
Set the MERGIFY_TOKEN environment variable with your Mergify API token.
The plugin activates automatically when running in CI (detected via the CI environment variable). To enable outside CI, set PYTEST_MERGIFY_ENABLE=true.
Environment Variables
| Variable | Description | Default |
|---|---|---|
MERGIFY_TOKEN |
Mergify API authentication token | (required) |
MERGIFY_API_URL |
Mergify API endpoint | https://api.mergify.com |
PYTEST_MERGIFY_ENABLE |
Force-enable outside CI | false |
PYTEST_MERGIFY_DEBUG |
Print spans to console | false |
MERGIFY_TRACEPARENT |
W3C distributed trace context | — |
MERGIFY_TEST_JOB_NAME |
Mergify test job name | — |
MERGIFY_TEST_SELECTION_DISABLE |
Opt out of test selection (see below) | false |
For detailed documentation, see the official guide.
Test selection
When Mergify's merge queue reruns a job — a retry, or a step of a batch bisection — only the tests that failed on the previous attempt are informative. The plugin asks Mergify whether the current run is such a rerun and, if so, runs only those tests; the rest are reported as deselected.
Nothing to configure: the plugin uses the token and job identity it already has, and Mergify decides. Any other situation — a normal run, a rerun Mergify has no previous results for, an unreachable API — runs the full suite, so the feature can only remove work, never coverage. The feature is also enabled per organization on Mergify's side, so it stays inactive until your organization is opted in.
Set MERGIFY_TEST_SELECTION_DISABLE=true in your CI to opt out: the plugin
then always runs the full suite and never queries the endpoint. It is scoped
to this feature only — test tracing, flaky detection and quarantine keep
working (unset MERGIFY_TOKEN to turn the plugin off entirely).
Development
Prerequisites
- Python >= 3.8
- uv
Setup
uv sync
Running Tests
uv run poe test
Linting
uv run poe linters
License
GPL-3.0-only
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