Issue #66: Add default value and update unit test #428

Job	Run time
ci / check if job needs to run	6s
ci / prepare test matrix	19s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - mod_cms	2m 45s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - mod_cms	3m 18s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - mod_cms	3m 4s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - mod_cms	3m 34s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - mod_cms	3m 1s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - mod_cms	3m 2s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - mod_cms	3m 5s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - mod_cms	3m 8s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - mod_cms	3m 8s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - mod_cms	3m 30s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - mod_cms	3m 22s
ci / Release to the Moodle plugin directory	0s
	35m 22s

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