This file is indexed.

/usr/lib/mysql-testsuite/r/have_utf8mb4.require is in mysql-testsuite-5.6 5.6.16-1~exp1.

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

The actual contents of the file can be viewed below.

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Collation	Charset	Id	Default	Compiled	Sortlen
utf8mb4_general_ci	utf8mb4	45	Yes	Yes	1