From 21% to 82%.
* Added missing @covers, broadened @covers where appropriate.
* Added tests for some code that lacked them.
* Added a parameter to control the use of hash_pbkdf2() so that the pure
PHP fallback could be tested. In the non-fallback test, force the use
of the extension, and mark it skipped if it is not installed.
Bug: T167003
Change-Id: I987e1a89ec343907f4ead7f6192b2d4deb58ac16
Follows-up b36d883.
By far most data providers are static (and PHPUnit expects them
to be static and calls them that way).
Most of these classes already had their data providers static
but additional commits sloppily introduced non-static ones.
* ResourceLoaderWikiModuleTest, 8968d8787f.
* TitleTest, 545f1d3a73.
Odd unused method 'dataTestIsValidMoveOperation' was introduced
in 550b878e63.
* GlobalVarConfigTest, a3e18c3670.
Change-Id: I5da99f7cd3da68c550ae507ffe1f725d31e7666f
