Implement inline code coverage remarks inside merge request changes tab file diffs
This would be really nice but hard to do cross-programming languages.
- Phabricator does it for PHP https://secure.phabricator.com/book/phabricator/article/arcanist_coverage/
- Atlassian does it for Java https://www.atlassian.com/software/clover/overview
- Code Climate does it in GitHub https://github.com/marketplace/code-climate
The relevant (free) tools are: