10 best Go Assertion libraries in 2025

Assertions help us make sure that the code does what it is intended to do. It is an essential part of programming to develop robust code. They are a set of statements that take action when a condition is not as expected. The ideal assertion library will have expressive assert functions, fluent assertions, and readable error messages. The assertion library should be simple and work on any Go project regardless of the framework being used. Go’s testing package is simple and elegant. There is no need to use a third party library to perform automated testing. Let’s see the 10 best open-source Go Assertion Libraries in 2022: testify - common assertions and mocks that plays nicely; testza - Full-featured test framework for Go! Assertions, fuzzing, input testing, output capturing, and much; gcassert - Assert your Go code is inlined and boundscheck eliminated.