This file is indexed.

/usr/lib/mysql-testsuite/t/range_icp.test is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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

The actual contents of the file can be viewed below.

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# 
# Run range.inc with index_condition_pushdown
#

--source include/have_index_condition_pushdown.inc

set optimizer_switch='index_condition_pushdown=on';

--disable_query_log
if (`select locate('semijoin', @@optimizer_switch) > 0`) 
{
  set optimizer_switch='semijoin=off';
}
if (`select locate('materialization', @@optimizer_switch) > 0`) 
{
  set optimizer_switch='materialization=off';
}
if (`select locate('mrr', @@optimizer_switch) > 0`) 
{
  set optimizer_switch='mrr=off';
}
--enable_query_log

--source include/range.inc

set optimizer_switch=default;