Automation in Code Reviews

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Automation in Code Review Alina Mihaila Sr Backend Engineer at GitLab

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Automation in Code Review ● What is code review? ● What can be automate in code reviews? ● Tools that assist with code review at GitLab ● What is next? ● Q&A

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Code Review process at GitLab ● Code changes are reviewed by minimum 2 engineers (reviewer + maintainer) ● Code reviews for multiple categories (frontend, backend, database, UX, QA) ● Code review for multiple domain expertise CI, Product Intelligence, Tooling ) ● Example MR with multiple reviewers

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What can be automate in code reviews? Source: monkeyuser.com Example MR vale

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Automation examples in code review at GitLab ● Code Quality Widget ○ Uses codeclimate ○ Example MR

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Automation examples in code review at GitLab ● Test coverage visualization ○ Simplecov(Ruby) ○ (Istanbul)JavaScript ○ PHP Unit PHP ○ gocover(Go lang) ○ Coverage.py(Python) ○ Example of MR

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Automation examples in code review at GitLab ● Danger (GitLab, Github, Bitbucket) ○ Automates common code review task ○ Runs in CI ○ Codify code guidelines (using the danger ﬁles) ○ Ruby and Javascript ○ GitLab Danger gem(Roulette) ○ Example MR1, MR2

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More automation examples in code review ● Automated database migration testing (Example MR) ○ Uses postgres.ai thin-clone technology. ○ Runs migration on GitLab.com dataset. ○ Used before the migration code is merged and deployed. ○ Analyze migrations and behaviour before deploying to production.

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What is next? ● Unreview ○ GitLab recently announced Machine Learning based solution for automatically identifying appropriate expert code reviewer Here is an early mockup (and it may differ from our ﬁnal UI)

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Q&A Contact ● [email protected] ● Linkedin

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● How to carry out effective code reviews ● The code review struggle is real. Here's what you need to know ● What are the most effective features for code review tools? ● How GitLab's 5 new code review features will make life easier ● Faster Code Reviews ● The road to smarter code reviewer recommendations ● Code Review Guidelines ● Code review docs Resources