[Gravity] Add return types for mariadb test helper classes

Review Request #688 — Created Jan. 29, 2020 and submitted — Latest diff uploaded

Information
pprkut
Lunr
df8c493...
Reviewers
lunr 
Add return types for mariadb test helper classes
Unit tests
src/Lunr/Gravity/Database/MariaDB/Tests/Helpers/AbstractMariaDBDatabaseAccessObjectTest.php
src/Lunr/Gravity/Database/MariaDB/Tests/Helpers/MariaDBDatabaseAccessObjectTest.php
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