/usr/share/doc/r-cran-assertthat/tests/testthat.R is in r-cran-assertthat 0.2.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | library(testthat)
library(assertthat)
test_check("assertthat")
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