Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
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The industry standard for API mocking in JavaScript.
- msw
- mock
- mocking-framework
- service-worker
Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.
- mock-server
- proxy
- java-client
- javascript-client
A utility for mocking out the Python Requests library.
- tag-production
libfaketime modifies the system time for a single application
- ld-preload
- datetime
- wrapper
- intercept-calls
DummyJSON.com provides different types of REST Endpoints filled with JSON data which you can use in developing the frontend with your favorite framework and library without worrying about writing a backend.
- json
- json-api
- json-server
- javascript
🔮 Proxies nodejs require in order to allow overriding dependencies during testing.
Embedded unit testing framework for Godot 4 supporting GDScript and C#. Features test-driven development, embedded test inspector, extensive assertions, mocking, scene testing.
DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses.
- http-server
- dump
- dummy
- testing
Simplify software testing, by easily mocking any system using HTTP/HTTPS, allowing a team to test and develop against a service that is not complete or is unstable or just to reproduce planned/edge cases.
netDumbster is a .Net Fake SMTP Server clone of the popular Dumbster
- c-sharp
- unit-testing
- smtp
- smtp-server
A lightweight Snowflake emulator built with Go and DuckDB for local development and testing
A simple Elixir package to elegantly mock module functions within (asynchronous) ExUnit tests using Erlang's :meck library
- elixir
- mocking
- exunit
- meck
Open-source Modbus RTU/TCP slave simulator for the LRI AEM-60DC8 industrial DC monitor — 147 holding registers, 8 DC channels, 6 baudrates. SCADA/PLC integration testing without hardware.