8 best Go Functional testing libraries in 2025

Functional testing makes sure that the application is working as per specification. Functional testing is done to verify business requirements, while non-functional testing includes security, load, and performance testing. There is a myriad of testing tools and frameworks available for Go, but some of them are not suited for functional testing. A functional test is an automated test that checks the features and functionality of a web application. In this kit, we will review some of the best Go frameworks to help you get started with functional testing. iris - The fastest HTTP/2 Go Web Framework; k6 - A modern load testing tool, using Go and JavaScript; test-infra - Test infrastructure for the Kubernetes project.