/usr/lib/R/site-library/Gviz/extdata/test.fa.fai is in r-bioc-gviz 1.14.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2
chr1 100000 6 80 81 chr2 200000 101262 80 81