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/usr/lib/mysql-testsuite/include/have_blackhole.inc is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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