pytest-instafail
pytest plugin to show failures instantly
Decision gist · record as of 2026-08-14
Yes. This is a low-friction, well-maintained plugin with no security issues that directly improves the test development experience. If you run pytest regularly and want faster feedback on failures, it's worth adding to your workflow—the --instafail flag is optional, so you can enable it only when needed.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires pytest 5 or newer and Python 3.7 or PyPy3.
- Low friction installation; the package depends only on pytest and is distributed as a pure Python wheel.
- Maintenance is active with recent commits and no known vulnerabilities.
License · maintenance · safety
BSD (permissive) — BSD license is permissive; you can use, modify, and distribute this package with minimal restrictions, making it safe for both open-source and commercial projects.
last release 2023-03-31 (1232 days) · last repo commit 2026-03-02 · 147 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 7,280,646 downloads/mo, #1,758 on PyPI
Alternatives
Verify before relying
pip install pytest-instafail
Then run tests with:
pytest --instafail- Whether the plugin works correctly with pytest's parallel execution modes (e.g., pytest-xdist).
- Performance impact on large test suites with many concurrent failures.
What it is and what it does
pytest-instafail is a pytest plugin that changes how test failures are reported during a test run. Instead of collecting all failures and displaying them at the end of the session, it shows each failure or error as it happens, giving you immediate feedback on what broke. This is particularly useful during development when you want to see problems right away rather than waiting for the full test suite to complete.
The plugin integrates seamlessly into pytest's reporting system and requires only a single command-line flag (--instafail) to enable. It has a single runtime dependency on pytest itself, making it lightweight and easy to adopt in any pytest-based project. The package supports Python 3.7 through 3.11 and PyPy3, and has been actively maintained since its initial release in 2013.
Use it for
- Enable faster feedback loops during test-driven development by seeing failures immediately instead of waiting for the full test suite.
- Diagnose cascading test failures more quickly by identifying the first failure in a chain without running the entire suite.
- Integrate into CI/CD pipelines where early failure detection can save time and resources.
- Debug flaky tests by observing the exact moment a test fails in real time rather than in a summary report.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
This is a low-friction, well-maintained plugin with no security issues that directly improves the test development experience. If you run pytest regularly and want faster feedback on failures, it's worth adding to your workflow—the --instafail flag is optional, so you can enable it only when needed.
Install
pytest-instafail on PyPI
Before you install
Low friction installation; the package depends only on pytest and is distributed as a pure Python wheel. Maintenance is active with recent commits and no known vulnerabilities.
Requires pytest 5 or newer and Python 3.7 or PyPy3.
License in practice
BSD license is permissive; you can use, modify, and distribute this package with minimal restrictions, making it safe for both open-source and commercial projects.
Quickstart
pip install pytest-instafail
Then run tests with:
pytest --instafailVerify before relying
- Whether the plugin works correctly with pytest's parallel execution modes (e.g., pytest-xdist).
- Performance impact on large test suites with many concurrent failures.
Package facts
| License | BSD permissive |
| Python support | Supports the current Python release >=3.7 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagepytest |
| Maintenance | Actively maintained 1,232 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 7,280,646 / month, #1,758 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: BSD LicenseOperating System :: MacOS :: MacOS XOperating System :: Microsoft :: WindowsOperating System :: POSIXProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: LibrariesTopic :: Software Development :: TestingTopic :: Utilities |
Evidence: pytest_instafail-0.5.0-py3-none-any.whl
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See also pytest-progress · pytest-sugar · pytest-github-actions-annotate-failures · pytest-repeat · pytest-rerunfailures · pytest-sentry · pytest-check · pytest-error-for-skips · pytest-ignore-test-results · testinfra