This file is indexed.

/usr/lib/mysql-testsuite/include/not_blackhole.inc is in mysql-testsuite-5.6 5.6.16-1~exp1.

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The actual contents of the file can be viewed below.

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if (`SELECT count(*) FROM information_schema.engines WHERE
     (support = 'YES' OR support = 'DEFAULT') AND
     engine = 'blackhole'`){
  skip Blackhole engine enabled;
}