The standard library testing package in Go does many things well. It is simple to use and executes fast and efficiently, even running tests in parallel and the caching results. However, many including myself, have turned to supplemental packages to address some blind spots when writing tests:

One of the most notorious design decisions of Go is how it approaches error handling. Go handles errors explicitly by returning them as values from any function that can possibly raise an error. To many, this way of error handling is uncomfortable at first. The tediousness of having every function not only return an optional error but also check the returned error from every function seemed to be too tedious.