I am writing a light-weight data frame class and want to borrow the test
cases from the standard data frame. I found the test cases in
library/base/R-ex/Extract.data.frame.R, but surprisingly no
corresponding .Rout files. In fact there is no *.Rout file in the entire
tarball. Not that I cann't generate them, but I am just curious why they
are not there? How does the base package get tested?