Best Testing libraries (2026)

The 15 best open-source Testing libraries in 2026, ranked by our maintenance-health metric plus real adoption (stars and weekly downloads) and security signals. Right now bun leads the field with a 100/100 health score. Each links to a full analysis with install commands, license, and alternatives.

1. 1

   bun

   bun is an open-source Rust project in the testing space with 93.1k GitHub stars. The repository is actively maintained, with recent commits.

   Rust 93,332 100
2. 2

   playwright

   Playwright is a cross-browser automation and end-to-end testing framework that drives Chromium, Firefox, and WebKit through a single API. It pairs a full-featured test runner (auto-waiting, resilient locators, tracing, parallel isolated contexts) with a browser-automation library, plus CLI and MCP integrations for AI agents.

   TypeScriptApache-2.0 91,226 100
3. 3

   hoppscotch

   hoppscotch is an open-source TypeScript project with 79.5k GitHub stars. It is associated with api, api-client, api-rest, api-testing. The repository is actively maintained, with recent commits.

   TypeScriptMIT 79,576 100
4. 4

   imgui

   imgui is an open-source C++ project with 73.8k GitHub stars. It is associated with api, cplusplus, framework, game-development. The repository is actively maintained, with recent commits.

   C++ 73,931 100
5. 5

   Front-end-Developer-Interview-Questions

   Front-end-Developer-Interview-Questions is an open-source Nunjucks project with 60.9k GitHub stars. It is associated with css-questions, front-end, html-questions, interview-questions. The repository is actively maintained, with recent commits.

   NunjucksMIT 60,884 100
6. 6

   etcd

   etcd is an open-source Go project with 51.8k GitHub stars. It is associated with cncf, consensus, database, distributed-database. The repository is actively maintained, with recent commits.

   GoApache-2.0 51,856 100
7. 7

   dubbo

   dubbo is an open-source Java project in the testing space with 41.5k GitHub stars. The repository is actively maintained, with recent commits.

   JavaApache-2.0 41,519 100
8. 8

   googletest

   googletest is an open-source C++ project with 38.7k GitHub stars. The repository is actively maintained, with recent commits.

   C++BSD-3-Clause 38,725 100
9. 9

   insomnia

   insomnia is an open-source TypeScript project with 38.5k GitHub stars. It is associated with api, api-client, api-design, curl. The repository is actively maintained, with recent commits.

   TypeScriptApache-2.0 38,716 100
10. 10

    sqlmap

    sqlmap is an open-source Python project with 37.6k GitHub stars. It is associated with api-security, appsec, database, database-security. The repository is actively maintained, with recent commits.

    Python 37,695 100
11. 11

    mongoose

    mongoose is an open-source JavaScript project with 27.5k GitHub stars. It is associated with mongo, mongodb, nodejs, odm. The repository is actively maintained, with recent commits.

    JavaScriptMIT 27,481 6M/wk 100
12. 12

    mocha

    mocha is an open-source JavaScript project with 22.9k GitHub stars. It is associated with bdd, browser, javascript, mocha. The repository is actively maintained, with recent commits.

    JavaScriptMIT 22,965 14.2M/wk 100
13. 13

    authentik

    authentik is an open-source Python project with 22k GitHub stars. It is associated with authentication, authentik, authorization, kubernetes. The repository is actively maintained, with recent commits.

    PythonMIT 22,061 100
14. 14

    Catch2

    Catch2 is an open-source C++ project with 20.4k GitHub stars. It is associated with bdd, cpp, cpp14, framework. The repository is actively maintained, with recent commits.

    C++ 20,453 100
15. 15

    graphql-js

    graphql-js is an open-source TypeScript project with 20.4k GitHub stars. It is associated with graphql, graphql-js. The repository is actively maintained, with recent commits.

    TypeScriptMIT 20,402 100