add test for record_for_cmid_exists #251

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	3m 59s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 59s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 32s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 14s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 53s
test (8.1, MOODLE_403_STABLE, mariadb, false)	4m 12s
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 57s
test (8.1, MOODLE_404_STABLE, mariadb, false)	3m 59s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 46s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 12s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 52s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 51s
test (8.2, MOODLE_404_STABLE, pgsql, false)	3m 54s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 51s
test (8.3, MOODLE_404_STABLE, pgsql, false)	3m 49s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 48s
test (8.3, main, mariadb, true)	3m 58s
	1h 4m 46s

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