Add tests to check, that words partially containing an entity name won't get glossified

All done, please review!

Note, that "@covers ::parseTooltipMatch" was never meant for methods:

Attribute "PHPUnit\Framework\Attributes\CoversMethod" cannot target method (allowed targets: class)

Therefore I removed it. We could add it to the class, but CoversClass should be enough IMO.

Nice, thank you @grevil!! :)

All green!