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.
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Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
Cross-platform multi-protocol mock server — HTTP, WebSocket, gRPC, GraphQL, TCP, Redis, SMTP, MQTT — with a web UI, scenario system, and fault injection.
UnitTestEx provides .NET testing extensions to the most popular testing frameworks (MSTest, NUnit and Xunit) specifically to improve the testing experience with ASP.NET controller, and Azure Function, execution including underlying HttpClientFactory mocking.
Port-free service routing for Go tests and CI: dial services by name with readiness built into the dial, an optional HTTP forward proxy, and a self-healing Kubernetes port-forward backend.