pytest-openfeature

Drive pytest configuration from an OpenFeature provider. Resolve registered pytest options (CLI and ini) at session start so a single feature-flag service can steer your test fleet — most obviously, pytest-randomly's --randomly-seed, but any registered option works.

Status: early/draft. The API and configuration surface may change before 1.0.

Why

You have a fleet of CI runs and you'd like to:

• Pin them all to the same --randomly-seed for a day, then roll forward.
• Flip -x on for a subset of branches without editing every workflow.
• Roll out a pytest invocation tweak gradually using your existing flag service's targeting rules.

pytest-openfeature resolves a flag from any spec-compliant OpenFeature provider and writes its value into the matching pytest option before the plugin chain reads it.

Install

pip install pytest-openfeature
# plus any OpenFeature provider you use, e.g.:
pip install openfeature-provider-flagd

Quick start

# pyproject.toml
[tool.pytest_openfeature]
strict = false

[tool.pytest_openfeature.flags]
"ci.pytest_randomly_seed" = "randomly_seed"

[tool.pytest_openfeature.provider]
type = "flagd"
endpoint = "https://flagd.internal/eu"

$ pytest tests/
openfeature: provider=flagd, 1 flag resolved
  randomly_seed       <-- ci.pytest_randomly_seed  = 20260427    (TARGETING_MATCH)
Using --randomly-seed=20260427
================== test session starts ==================

A developer overriding the flag locally still wins:

$ pytest --randomly-seed=42 tests/

CLI > PYTEST_ADDOPTS > OpenFeature > ini > pytest default.

Configuration

Equivalent ini keys ([pytest] / [tool:pytest] / setup.cfg) all start with openfeature_. Env vars use PYTEST_OPENFEATURE_*.

Hooks

Plugin authors can register a provider or modify the evaluation context from a project's conftest.py:

def pytest_openfeature_provider(config):
    from my_provider import MyProvider
    return MyProvider(api_key=os.environ["FF_KEY"])

def pytest_openfeature_context(config, context):
    context.attributes["team"] = "platform"
    return context

Fixtures

openfeature_client exposes the session-scoped client to your tests when you want to consult flags from inside a test.

License

MIT