HasTests returns true if the given package contains test files.

ListPackages calls `go list` for every package spec given.

ListProjectPackages lists all packages in the current project.

ListTestFiles lists all go and cgo test files available in a package.

Get runs `go get` and provides optionals for adding command line arguments.

Licenser runs `go-licenser` and provides optionals for adding command line arguments.

Test runs `go test` and provides optionals for adding command line arguments.

Args holds parameters, environment variables and flag information used to pass to the go tool.

ArgOpt is a functional option adding info to Args once executed.