Use pathinfo() in AutoLoaderStructureTest::testPSR4Completeness
When setting AutoloadNamespaces to './' in extension.json, the test
AutoLoaderStructureTest::testPSR4Completeness would fail. The directory
path is not made canonical while the file is, which causes the substr()
call being used to strip too many characters. For example:
$dir : /mediawiki/extensions/Wikidata.org/./
$file: /mediawiki/extensions/Wikidata.org/Hooks.php
$abbrFileName = substr( substr( $file, strlen( $dir ) ), 0, -4 );
>>> oks
Use pathinfo() to parse the filename. Yields 'Hooks' as expected.
Bug: T198077
Change-Id: Ia8a11d87788b32ddb426a16a61b410b05ff5f15e