Testing fasthttp with httptest

I am wondering how I can test an application that's written with fasthttp using the httptest package in the base library of Go.

I found this guide which explains the testing pretty well, but the issue is that httptest does not satisfy the http.Handler interface so I have no idea how to do the http.HandlerFunc since fasthttp uses it's own fasthttp.ListenAndServe that's incompatible.

Any ideas on how to create a wrapper, or how to otherwise test a fasthttp written library end to end?