/usr/share/doc/r-cran-pillar/tests/testthat/out/rowid-3.txt is in r-cran-pillar 1.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4
[3m[90m [39m[23m [90m1[39m [90m2[39m [90m3[39m