Module testify is a set of packages that provide many tools for testifying that your code will behave as you intend. Testify contains the following packages: The github.com/stretchr/testify/assert package provides a comprehensive set of assertion functions that tie in to the Go testing system. The github.com/stretchr/testify/require package provides the same assertions but as fatal checks. The github.com/stretchr/testify/mock package provides a system by which it is possible to mock your objects and verify calls are happening as expected. The github.com/stretchr/testify/suite package provides a basic structure for using structs as testing suites, and methods on those structs as tests. It includes setup/teardown functionality in the way of interfaces. A golangci-lint compatible linter for testify is available called testifylint.