Waits until any file belonging to the current project and required by the Go package in the current directory changes.

$ (cd /; GO111MODULE=on go get github.com/mkmik/waigo@master)

$ cd myproject/pkg/somepkg
$ while waigo; do go test; done

Now you can edit sources in this package and in other related packages in your project and have the test for the current package re-run if anything changes.

Handy in combination with arepa:

; cat ~/bin/ago
#!/bin/bash

exec arepa -t waigo go "$@"