This file is indexed.

/usr/lib/R/site-library/testit/INDEX is in r-cran-testit 0.7-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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assert                  Assertions with an optional message
has_warning             Check if an R expression produces warnings or
                        errors
test_pkg                Run the tests of a package in its namespace