How to get the directory of the package the file is in, not the current working directory

I'm making a package to make API calls to a service. I have a test package that I use just to test the API calls and test the functions of the main package which I just include the other package into. In my main package that I'm working on I have ioutil.ReadFile(filepath.Abs("Filename.pub")) Which is ok, but when I call it from my test package e.g. /Users/####/gocode/src/github.com/testfolder go r

[igtm]

Golangで dirname的なものを取得する方法。 _, filename, _, ok := runtime.Caller(0)

[zenmai-kingdom]

“untime.Caller”