Unit tests broken in > Moodle 4.1

[matthewhilton]

Since https://tracker.moodle.org/browse/MDL-64600 and https://tracker.moodle.org/browse/MDL-67673 lots of the tests are not running properly.

This is because of the removal of DB unit, so functions such as createXMLDataSet are not longer allowed.

e.g.

5) block_grade_me_testcase::test_query_glossary with data set "test1" ('glossary.xml', array(array(0, '0', 'glossary', 0, 'glossaryitem1', 0, 0, 0, 1424354368, 1), array(0, '0', 'glossary', 1, 'glossaryitem2', 1, 0, 0, 1424354369, 2), array(0, '0', 'glossary', 2, 'glossaryitem3', 2, 0, 0, 1424354370, 3)))
Error: Call to undefined method phpunit_dataset::getTableNames()

/var/www/ec-41/blocks/grade_me/tests/grade_me_test.php:56
/var/www/ec-41/blocks/grade_me/tests/grade_me_test.php:665
/var/www/ec-41/blocks/grade_me/tests/grade_me_test.php:595
/var/www/ec-41/lib/phpunit/classes/advanced_testcase.php:80