If you are testing correctly you should be able to:
Start from a new R session.
Call devtools::load_all() which loads all defined below R/.
Run an individual test or walk through it line-by-line
# dozens or hundreds of lines of self-sufficient, self-contained tests,# all of which you can safely ignore!test_that("f() works", { useful_thing <- ... x <- somePkg::someFunction(useful_thing)expect_equal(f(x), 2.5)})