Top 23 Mocking Open-Source Projects

• Testify

  65 22,152 8.6 Go

  A toolkit with common assertions and mocks that plays nicely with the standard library

  

Project mention: Why I don't use a third-party assertion library in Go unit tests | dev.to | 2024-05-20

Of course, as soon as people saw this, the third-party assertion helper libraries started appearing. The most popular one seems to be testify (although I've never used it). Personally, I thought that the explicit check would be good enough for me, but it's true that after writing a bunch of tests, the boilerplate does seem unnecessarily verbose.

• msw

  150 14,946 9.2 TypeScript

  Seamless REST/GraphQL API mocking library for browser and Node.js.

  

Project mention: Visual Introduction to Frontend Testing Types | dev.to | 2024-05-10

Mock Service Worker - https://mswjs.io/ (Mocking the API Responses in the browser without creating a separate mock server)

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• Mockito

  11 14,615 9.0 Java

  Most popular Mocking framework for unit tests written in Java

  

• Mockery

  3 10,572 9.4 PHP

  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).

  

• WireMock

  13 6,112 9.6 Java

  A tool for mocking HTTP services

  

Project mention: Fastify Meets WireMock: External Service Mocking | dev.to | 2024-02-13

This article reveals how to integrate WireMock into Fastify with ease, enabling developers to effortlessly generate mock responses for external services. Join us as we explore the straightforward process of seamlessly integrating and optimizing Fastify applications using WireMock for enhanced testing capabilities.

• mockoon

  48 5,921 9.3 TypeScript

  Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

  

Project mention: Handling Firebase Notifications in Flutter: Practical Tips | dev.to | 2024-01-14

Mockoon - Used as a logging server instead of using print in the console.

• mockery

  20 5,682 8.6 Go

  A mock code autogenerator for Go (by vektra)

  

Project mention: I Write Tests in Go | news.ycombinator.com | 2024-04-10

I'm far too lazy to write mocks by hand in go. You can generate a mock for a given interface with mockery https://github.com/vektra/mockery

• SaaSHub

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• OHHTTPStubs

  0 5,012 3.5 Objective-C

  Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!

• PowerMock

  2 4,129 0.0 Java

  PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.

  

• prism

  25 4,041 8.3 TypeScript

  Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations. (by stoplightio)

  

Project mention: How to Automatically Consume RESTful APIs in Your Frontend | dev.to | 2024-01-25

Since the OpenAPI can effectively describe our resources, we can reuse it to generate a dummy server that can be later used for development and testing purposes without bootstrapping any actual services. There some tools available that can help us with this task, such as Prism, OpenAPI Mock, OpenAPI Backend and the MSW library we have already seen.

• axios-mock-adapter

  3 3,394 1.8 JavaScript

  Axios adapter that allows to easily mock requests

• Pester

  24 3,032 7.3 PowerShell

  Pester is the ubiquitous test and mock framework for PowerShell.

  

Project mention: PyPyInstaller Powershell Module Initial Code Push | dev.to | 2023-09-25

Pester is what's used for most Powershell testing. While it has some pretty amazing features, it does have issues with .NET class method mocking and sometimes scope can be weird. Here's a simple example:

• VCR.py

  6 2,619 8.9 Python

  Automatically mock your HTTP interactions to simplify and speed up testing

• NSubstitute

  11 2,562 7.4 C#

  A friendly substitute for .NET mocking libraries.

  

Project mention: What am I missing about interfaces? | /r/csharp | 2023-11-23

a. you might do so purely out of argo cult, i.e. because someone told you this was the right thing to do™, and that's a silly exercise. b. you could also be doing this for a good reason: to use the interface with a mocking tool like NSubstitute

• hoverfly

  4 2,314 8.8 Go

  Lightweight service virtualization/ API simulation / API mocking tool for developers and testers

  

• httpretty

  0 2,094 0.0 Python

  Intercept HTTP requests at the Python socket level. Fakes the whole socket module (by gabrielfalcao)

• gock

  10 2,030 3.4 Go

  HTTP traffic mocking and testing made easy in Go ༼ʘ̚ل͜ʘ̚༽

• mountebank

  1 1,979 6.8 JavaScript

  Over the wire test doubles

• moq

  16 1,775 3.6 Go

  Interface mocking tool for go generate (by matryer)

Project mention: vektra/mockery has fully released the "packages" feature! This blog explains what it is and how it works. | /r/golang | 2023-07-11

• DuckRails

  0 1,718 0.0 Ruby

  Development tool to mock API endpoints quickly and easily (docker image available)

• FakeItEasy

  1 1,645 8.5 C#

  The easy mocking library for .NET

  

• Cuckoo

  2 1,642 6.4 Swift

  Boilerplate-free mocking framework for Swift! (by Brightify)

  

Project mention: Tests Everywhere - Swift | dev.to | 2023-12-12

Swift testing this simple Hello World with XCTest and Cuckoo

• mockhttp

  5 1,551 6.2 C#

  Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.

Project mention: Mock heavy tests | /r/dotnet | 2023-06-01

I'd say that without wanting to refactor the code a little bit (maybe moving those HttpClients into a service so that they are easily mocked) your best bet would be to use something like WireMock or MockHttp.

• SaaSHub

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Mocking related posts

• I Write Tests in Go

  1 project | news.ycombinator.com | 10 Apr 2024

• Fastify Meets WireMock: External Service Mocking

  2 projects | dev.to | 13 Feb 2024

• Unit Test Like a Pro: Automock, My Open Source Answer to Mocking Frustration 🤓💡🎭

  1 project | dev.to | 12 Dec 2023

• Show HN: Automock – Open-Source Project for Simpler Unit Testing in TypeScript

  2 projects | news.ycombinator.com | 11 Dec 2023

• The most effective Schema-Driven Development using OpenAPI for Logistic Engineer

  2 projects | dev.to | 9 Dec 2023

• What direction can I take to mocking a data structure that is relational on the front-end while I wait for backend endpoints to be created?

  2 projects | /r/Frontend | 9 Dec 2023

• What direction can I take to mock a (relational?) data-structure on the front-end while I wait for backend endpoints to be created?

  2 projects | /r/webdev | 9 Dec 2023
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