Motivation:
ParserOptionsTest::testOptionsHash doesn't have a test case with variants yet.
https://doc.wikimedia.org/cover/mediawiki-core/includes/parser/ParserOptions.php.html
Expected result:
- More tests should be added.
- Specific tests that covers ParserOptions::optionsHash should be added
- Specific test that covers ParserOptions::optionsHash for language with variants should be added