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To be able to see the level of coverage with the current test suite,
do the following:

  - make sure gcov is installed
  - compile with BUILD/compile-pentium-gcov ( if your machine is not pentium, hack
this script, or just live with the pentium-specific stuff)
  - ./mysql-test-run -gcov
  - to see the level of coverage for a given source file:
     grep source_file_name /tmp/gcov.out
  - to see which lines are not yet covered, look at source_file_name.gcov in the source tree. Then think hard about a test case that will cover those
lines, and write one!