| Rank | Repo | Stars | Language | Developer |  | 1 | storybook | 77,657 | TypeScript | storybookjs |
| 2 | localstack | 46,345 | Python | localstack |
| 3 | cypress | 42,943 | JavaScript | cypress-io |
| 4 | jest | 41,685 | TypeScript | facebook |
| 5 | playwright | 48,858 | TypeScript | microsoft |
| 6 | mocha | 21,957 | JavaScript | mochajs |
| 7 | javascript-testing-best-practices | 21,092 | JavaScript | goldbergyoni |
| 8 | react-testing-library | 17,617 | JavaScript | testing-library |
| 9 | goreplay | 17,077 | Go | buger |
| 10 | Catch2 | 16,385 | C++ | catchorg |
| 11 | faker | 15,551 | Python | joke2k |
| 12 | httpbin | 11,562 | Python | postmanlabs |
| 13 | metersphere | 9,018 | Java | metersphere |
| 14 | robotframework | 7,883 | Python | robotframework |
| 15 | ginkgo | 7,018 | Go | onsi |
| 16 | pest | 6,599 | PHP | pestphp |
| 17 | hypothesis | 6,594 | Python | HypothesisWorks |
| 18 | ts-jest | 6,439 | TypeScript | kulshekhar |
| 19 | HeadlessBrowsers | 5,856 | unknown | dhamaniasad |
| 20 | howtheytest | 5,249 | HTML | abhivaikar |
| 21 | react-hooks-testing-library | 4,945 | TypeScript | testing-library |
| 22 | jest-cheat-sheet | 4,944 | unknown | sapegin |
| 23 | go-fuzz | 4,583 | Go | dvyukov |
| 24 | gotests | 4,492 | Go | cweill |
| 25 | cypress-realworld-app | 4,437 | TypeScript | cypress-io |
| 26 | wpt | 4,265 | HTML | web-platform-tests |
| 27 | tcpcopy | 4,219 | C | session-replay-tools |
| 28 | powermock | 3,982 | Java | powermock |
| 29 | httplab | 3,876 | Go | qustavo |
| 30 | bats-core | 3,858 | Shell | bats-core |
| 31 | go-cmp | 3,410 | Go | google |
| 32 | spock | 3,346 | Java | spockframework |
| 33 | qawolf | 3,214 | TypeScript | qawolf |
| 34 | macaca | 3,122 | unknown | alibaba |
| 35 | minitest | 3,121 | Ruby | minitest |
| 36 | swift-snapshot-testing | 3,097 | Swift | pointfreeco |
| 37 | database_cleaner | 2,850 | Ruby | DatabaseCleaner |
| 38 | react-native-testing-library | 2,717 | TypeScript | callstack |
| 39 | conftest | 2,559 | Go | open-policy-agent |
| 40 | testing-nestjs | 2,312 | TypeScript | jmcdo29 |
| 41 | nunit | 2,297 | C# | nunit |
| 42 | testing-distributed-systems | 2,215 | HTML | asatarin |
| 43 | spek | 2,210 | Kotlin | spekframework |
| 44 | jest-preview | 2,106 | TypeScript | nvh95 |
| 45 | ReportGenerator | 2,083 | C# | danielpalme |
| 46 | Penetration-Testing-Tools | 2,016 | PowerShell | mgeeky |
| 47 | SwiftMonkey | 1,941 | Swift | zalando |
| 48 | testbench | 1,925 | PHP | orchestral |
| 49 | user-event | 1,924 | TypeScript | testing-library |
| 50 | spectator | 1,901 | TypeScript | ngneat |
| 51 | Verify | 1,879 | C# | VerifyTests |
| 52 | shouldly | 1,825 | C# | shouldly |
| 53 | ex_machina | 1,805 | Elixir | thoughtbot |
| 54 | dusk | 1,733 | PHP | laravel |
| 55 | test-prof | 1,647 | Ruby | test-prof |
| 56 | QA_bible | 1,568 | unknown | VladislavEremeev |
| 57 | nextest | 1,460 | Rust | nextest-rs |
| 58 | wallaby | 1,456 | Elixir | elixir-wallaby |
| 59 | vfsStream | 1,359 | PHP | bovigo |
| 60 | mockhttp | 1,307 | C# | richardszalay |
| 61 | System.IO.Abstractions | 1,295 | C# | TestableIO |
| 62 | maelstrom | 1,243 | Clojure | jepsen-io |
| 63 | ultra | 1,235 | Clojure | venantius |
| 64 | busted | 1,174 | Lua | lunarmodules |
| 65 | Difference | 1,142 | Swift | krzysztofzablocki |
| 66 | laravel-mail-preview | 1,042 | PHP | spatie |
| 67 | pose | 1,019 | C# | tonerdo |
| 68 | cmockery | 938 | Shell | google |
| 69 | rack-test | 893 | Ruby | rack |
| 70 | bypass | 876 | Elixir | PSPDFKit-labs |
| 71 | mix-test.watch | 844 | Elixir | lpil |
| 72 | Kluent | 834 | Kotlin | MarkusAmshove |
| 73 | chefspec | 825 | Ruby | chefspec |
| 74 | meck | 780 | Erlang | eproxus |
| 75 | database_rewinder | 770 | Ruby | amatsuda |
| 76 | api_taster | 730 | Ruby | fredwu |
| 77 | kaocha | 723 | Clojure | lambdaisland |
| 78 | hspec | 707 | Haskell | hspec |
| 79 | haskell-hedgehog | 645 | Haskell | hedgehogqa |
| 80 | expecto | 597 | F# | haf |
| 81 | hammox | 501 | Elixir | msz |
| 82 | strikt | 483 | Kotlin | robfletcher |
| 83 | kotlin-power-assert | 471 | Kotlin | bnorm |
| 84 | marathon | 419 | Kotlin | MarathonLabs |
| 85 | eftest | 407 | Clojure | weavejester |
| 86 | PowerShellTraps | 401 | PowerShell | nightroman |
| 87 | test-refresh | 380 | Clojure | jakemcc |
| 88 | elm-test | 343 | Elm | elm-community |
| 89 | hamkrest | 340 | Kotlin | npryce |
| 90 | quickstrom | 334 | Python | quickstrom |
| 91 | mockito-scala | 314 | Scala | mockito |
| 92 | flutter_glove_box | 289 | Dart | eBay |
| 93 | spec | 285 | Dart | invertase |
| 94 | scalaprops | 275 | Scala | scalaprops |
| 95 | openQA | 262 | Perl | os-autoinst |
| 96 | fsharp-hedgehog | 247 | F# | hedgehogqa |
| 97 | waldo | 241 | R | r-lib |
| 98 | QuickChick | 227 | Coq | QuickChick |
| 99 | example-spark | 213 | Scala | mkuthan |
| 100 | chip8-test-rom | 200 | Roff | corax89 |
