$wgContLang is deprecated T160815 . MediaWikiTestCase throws an exception whenever one attempts to set it in a test via setMwGlobals():
1) NSFileRepo\Tests\NamespaceListTest::testGetReadableNoTalks MWException: No setting $wgContLang, use setContentLang() or setService( 'ContentLanguage' ) /workspace/src/tests/phpunit/MediaWikiTestCase.php:754 /workspace/src/extensions/NSFileRepo/tests/phpunit/NamespaceListTest.php:20 /workspace/src/tests/phpunit/MediaWikiTestCase.php:475 /workspace/src/maintenance/doMaintenance.php:94 2) NSFileRepo\Tests\NamespaceListTest::testGetReadableNoUnreadables MWException: No setting $wgContLang, use setContentLang() or setService( 'ContentLanguage' ) /workspace/src/tests/phpunit/MediaWikiTestCase.php:754 /workspace/src/extensions/NSFileRepo/tests/phpunit/NamespaceListTest.php:20 /workspace/src/tests/phpunit/MediaWikiTestCase.php:475 /workspace/src/maintenance/doMaintenance.php:94 3) NSFileRepo\Tests\NamespaceListTest::testMediaWikiTestCaseParentSetupCalled MWException: No setting $wgContLang, use setContentLang() or setService( 'ContentLanguage' ) /workspace/src/tests/phpunit/MediaWikiTestCase.php:754 /workspace/src/extensions/NSFileRepo/tests/phpunit/NamespaceListTest.php:20 /workspace/src/tests/phpunit/MediaWikiTestCase.php:475 /workspace/src/maintenance/doMaintenance.php:94 4) NSFileRepo\Tests\NamespaceListTest::testValidCovers MWException: No setting $wgContLang, use setContentLang() or setService( 'ContentLanguage' ) /workspace/src/tests/phpunit/MediaWikiTestCase.php:754 /workspace/src/extensions/NSFileRepo/tests/phpunit/NamespaceListTest.php:20 /workspace/src/tests/phpunit/MediaWikiTestCase.php:475 /workspace/src/maintenance/doMaintenance.php:94