Testify
Thou Shalt Write Tests in Go
...It features a specific set of packages, namely: assert package, which allows for better, more readable test code in Go; require package, which is similar to the assert package but instead of returning a boolean result, terminates the current test; mock package, which allows for easy writing of mock objects; and the suit package, which provides functionality similar to those of more common object oriented languages.
Testify is easy to install or update, and supports the three major Go versions (1.11, 1.12 and 1.13).