Special:InvestigateBlock allows users to make blocks after an investigation using Special:Investigate. There are a few changes planned for this class in T362548: Warn if blocking both IPs and accounts when using Special:InvestigateBlock and T318458: Add dropdown options for the reason in Special:InvestigateBlock (like Special:Block has), which mean that ideally this class should be mostly tested to help reduce the chances for Regression or bugs.
Acceptance criteria
- Test coverage for the SpecialInvestigateBlock file is increased to a reasonable number (coverage reported at https://doc.wikimedia.org/cover-extensions/CheckUser/src/Investigate/SpecialInvestigateBlock.php.html)