The `testthat` package is listed as Suggests, but `load_all()` calls `library(testthat)`: ```r > pkgload::load_all() ℹ Loading <my-package> Error in ("base" %:::% "library")("testthat", warn.conflicts = FALSE) : there is no package called ‘testthat’ > traceback() 3: stop(packageNotFoundError(package, lib.loc, sys.call())) 2: ("base" %:::% "library")("testthat", warn.conflicts = FALSE) 1: pkgload::load_all() ``` To reproduce: 1. Uninstall `testthat`. 2. Run `pkgload::load_all()` on any package. I think this could be fixed by checking if `testthat` is present beforehand.