'TestDeprecatedSubclass' => "$testDir/phpunit/includes/debug/TestDeprecatedSubclass.php",
# tests/phpunit/includes/diff
+ 'CustomDifferenceEngine' => "$testDir/phpunit/includes/diff/CustomDifferenceEngine.php",
'FakeDiffOp' => "$testDir/phpunit/includes/diff/FakeDiffOp.php",
# tests/phpunit/includes/externalstore