Improve unit testing of Collection classes.

[ Enhancements ]

• The unit testing now uses parameters, to define in phpunit.xml

to define storage resources.

[ phpunit.xml configuration file ]

For FilesCollectionTest:

• UNITTESTING_FILESCOLLECTION_PATH

For MongoDBCollectionTest:

• UNITTESTING_MONGODB_HOST
• UNITTESTING_MONGODB_PORT
• UNITTESTING_MONGODB_SSL

For MySQLTest:

• UNITTESTING_MYSQL_HOST
• UNITTESTING_MYSQL_USERNAME
• UNITTESTING_MYSQL_PASSWOR
• UNITTESTING_MYSQL_DATABASE

For SQLiteCollectionTest:

• UNITTESTING_SQLITE_FILE

[ Notes ]

• tests/phpunit.xml, like includes/config.php is the sample to ship and so shouldn't be committed to share your test configuration

• To run an external phpunit.xml file, you can use the command phpunit -c <path to your phpunit.xml> .

• MySQLTest and SQLiteCollectionTest are tests for the not yet in master branch MYSQL and SQLite storage collection classes.