find functions without a test function [duplicate]

This question already has an answer here:

• R code coverage for the testthat package 3 answers

I'm working on a personal R package and slowly trying to build / improve the documentation and testing functionality. I've been using the testthat package to help with the process of building tests for the code.

One issue is just keeping track of which functions in the package have had tests built for them.

Is there a way to find which functions don't currently have a test function built for them?