/usr/lib/R/site-library/testit/INDEX is in r-cran-testit 0.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | assert Assertions with a message
has_warning Check if an R expression produces warnings or
errors
test_pkg Run the tests of a package in its namespace
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