1.mswjs / msw
The industry standard for API mocking in JavaScript.
+86 stars
from 18,240 · score 4.47
Trending repositories
Ranked by Attention Score: stars gained over the last 30 complete days
23 repositories by Attention Score · Oct 4, 2026 – Nov 2, 2026 (UTC)
2.stretchr / testify
A toolkit with common assertions and mocks that plays nicely with the standard library
+51 stars
from 26,189 · score 3.95
3.mockoon / mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
+43 stars
from 8,424 · score 3.78
4.godot-gdunit-labs / gdUnit4
Embedded unit testing framework for Godot 4 supporting GDScript and C#. Features test-driven development, embedded test inspector, extensive assertions, mocking, scene testing.
+42 stars
from 1,244 · score 3.76
5.wiremock / wiremock
A tool for mocking HTTP services
+30 stars
from 7,385 · score 3.43
6.stoplightio / prism
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
+26 stars
from 5,038 · score 3.30
7.microcks / microcks
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
+23 stars
from 2,050 · score 3.18
8.pester / Pester
Pester is the ubiquitous test and mock framework for PowerShell.
+21 stars
from 3,351 · score 3.09
9.vektra / mockery
A mock code autogenerator for Go
+13 stars
from 7,162 · score 2.64
10.mockito / mockito
Most popular Mocking framework for unit tests written in Java
+12 stars
from 15,440 · score 2.56
11.SpectoLabs / hoverfly
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
+12 stars
from 2,521 · score 2.56
12.nsubstitute / NSubstitute
A friendly substitute for .NET mocking libraries.
+7 stars
from 2,976 · score 2.08
13.mockery / mockery
Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).
+5 stars
from 10,720 · score 1.79
14.kevin1024 / vcrpy
Automatically mock your HTTP interactions to simplify and speed up testing
+5 stars
from 3,017 · score 1.79
15.FakeItEasy / FakeItEasy
The easy mocking library for .NET
+4 stars
from 1,851 · score 1.61
16.3lvis / Networking
Swift HTTP Networking with stubbing and caching support
+4 stars
from 1,377 · score 1.61
17.AliSoftware / OHHTTPStubs
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
+2 stars
from 5,064 · score 1.10
18.matryer / moq
Interface mocking tool for go generate
+2 stars
from 2,204 · score 1.10
19.tonerdo / pose
Replace any .NET method (including static and non-virtual) with a delegate
+2 stars
from 1,104 · score 1.10
20.tianchangNorth / pocket-mocker
In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.
+2 stars
from 523 · score 1.10
21.mindflayer / python-mocket
a socket mock framework - for all kinds of socket animals, web-clients included
+2 stars
from 311 · score 1.10
22.pnuckowski / aioresponses
Aioresponses is a helper for mock/fake web requests in python aiohttp package.
+1 stars
from 555 · score 0.69
23.atilaneves / unit-threaded
Advanced unit test framework for D
+1 stars
from 123 · score 0.69