pytest-beartype-tests
Pytest plugin that applies @beartype to every collected test function.
Decision gist · record as of 2026-08-14
Yes, if you want automatic runtime type-checking on test functions with minimal setup. Install friction is low and the plugin is actively maintained. However, be aware this is a temporary workaround for functionality expected in pytest-beartype 0.3.0—plan to migrate when that release arrives. The project is very new with minimal adoption, so edge cases may not be well-tested.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.11 or later; the plugin auto-registers via pytest11 entry point with no configuration needed.
- Low install friction with only two runtime dependencies (beartype and pytest).
- Active maintenance with a recent commit on 2026-08-13, though the project is new (first release 2026-04-19) and has minimal adoption signals (2 stars).
License · maintenance · safety
permissive license (permissive) — MIT License permits unrestricted use, modification, and distribution with only attribution required—no restrictions on commercial or proprietary use.
last release 2026-04-26 (110 days) · last repo commit 2026-08-13 · 2 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 139,866 downloads/mo, #11,285 on PyPI
Alternatives
Verify before relying
# Install
pip install pytest-beartype-tests
# In your test file, just write normally with type hints:
def test_example(x: int) -> None:
assert x > 0
# Run pytest; the plugin auto-registers and applies beartype to all test functions
pytest test_example.py- Whether the plugin works with pytest fixtures and parameterized tests beyond basic function signatures.
- Performance overhead of applying beartype to every test function in large test suites.
- Compatibility with other pytest plugins that also modify test collection or execution.
- Whether this plugin will be superseded by pytest-beartype 0.3.0 as documented, and on what timeline.
What it is and what it does
pytest-beartype-tests is a minimal pytest plugin that wraps every collected test function with beartype's runtime type-checking decorator. It catches type violations in test signatures and any locally-typed variables inside test bodies at runtime, without requiring manual decorator application to each test.
The plugin auto-registers via pytest's entry point system and requires no configuration. It is explicitly positioned as a temporary workaround until pytest-beartype 0.3.0 is released with native support for this functionality. The package depends on beartype and pytest, both of which are standard in Python testing workflows.
Use it for
- Catch type mismatches in test function parameters before test logic runs, surfacing contract violations early.
- Validate locally-typed variables within test bodies to ensure test code itself respects its own type hints.
- Add runtime type safety to test suites without manually decorating every test function with @beartype.
- Detect when test fixtures or parametrized inputs violate expected types before assertions are evaluated.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you want automatic runtime type-checking on test functions with minimal setup.
Install friction is low and the plugin is actively maintained. However, be aware this is a temporary workaround for functionality expected in pytest-beartype 0.3.0—plan to migrate when that release arrives. The project is very new with minimal adoption, so edge cases may not be well-tested.
Install
pytest-beartype-tests on PyPI
Before you install
Low install friction with only two runtime dependencies (beartype and pytest). Active maintenance with a recent commit on 2026-08-13, though the project is new (first release 2026-04-19) and has minimal adoption signals (2 stars).
Requires Python 3.11 or later; the plugin auto-registers via pytest11 entry point with no configuration needed.
License in practice
MIT License permits unrestricted use, modification, and distribution with only attribution required—no restrictions on commercial or proprietary use.
Quickstart
# Install
pip install pytest-beartype-tests
# In your test file, just write normally with type hints:
def test_example(x: int) -> None:
assert x > 0
# Run pytest; the plugin auto-registers and applies beartype to all test functions
pytest test_example.pyVerify before relying
- Whether the plugin works with pytest fixtures and parameterized tests beyond basic function signatures.
- Performance overhead of applying beartype to every test function in large test suites.
- Compatibility with other pytest plugins that also modify test collection or execution.
- Whether this plugin will be superseded by pytest-beartype 0.3.0 as documented, and on what timeline.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.11 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagesbeartypepytest |
| Maintenance | Actively maintained 110 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 139,866 / month, #11,285 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaFramework :: PytestLicense :: OSI Approved :: MIT LicenseProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14 |
Evidence: pytest_beartype_tests-2026.4.26-py3-none-any.whl
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