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Hypothesis

Repository: HypothesisWorks/hypothesisHomepage

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

What Hypothesis is

Hypothesis is a property-based testing library for Python. Tests describe a range of inputs and state properties that should hold for every input in it. Hypothesis then picks inputs from that range at random, including edge cases. Input ranges are declared with strategies passed to the @given decorator. When a test fails, Hypothesis reports the simplest failing example it finds instead of an arbitrary one. The package installs with pip, and optional extras are available.

Written from the project's README, read , and its documentation (see sources).

Category
Unit testing and test runners
License
MPL-2.0
Language
Python
Changelog
Releases on GitHub

Repository metrics

Repository metrics
Stars9,0031
Forks6761
Open issues and PRs441
Contributors3741
Commits in the last 90 days3331
Last commit2026-09-081
Last releasev6.168.0, 2026-09-081
Fetched

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

Status

activeLast commit within 90 days of the fetch date.

Computed from the last commit date and the archive flag on the fetch date. See the status rules.

Alternatives

Listed unit testing and test runners tools, same primary language first, then by GitHub stars. Each line gives one fact from the tool's documentation where it differs from Hypothesis's, with its source.

How to install

pip install hypothesis
From README, read .

Questions

Is Hypothesis open source?

Yes. Hypothesis is released under MPL-2.0, an OSI-approved license, as reported by the GitHub API on 2026-09-22.

Is Hypothesis maintained?

On 2026-09-22, the last commit to the default branch was on 2026-09-08, so the listed status is active. Rule: Last commit within 90 days of the fetch date.

How many GitHub stars does Hypothesis have?

9,003 stars on 2026-09-22, from the GitHub API. The number is refreshed at each monthly update.

What language is Hypothesis written in?

The repository's primary language, as reported by the GitHub API, is Python.

How do I install Hypothesis?

The README gives this command: pip install hypothesis

Sources

  1. GitHub REST API: repository, read
  2. GitHub REST API: commits, read
  3. GitHub REST API: latest release, read
  4. GitHub REST API: contributors, read
  5. LICENSE file, read
  6. README, read