Suggest an editImprove this articleRefine the answer for “How does CI check code quality?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**CI** checks code quality automatically, running a set of checks on every change: builds, tests, linters, static analysis, and security checks. **Key point:** CI prevents changes with errors from reaching the main branch and does not replace code review, it automates routine work.Shown above the full answer for quick recall.Answer (EN)ImageCI checks code quality **automatically**, running a set of checks on every change, to **catch errors early and stop bad code from moving forward**. Simply put: *CI is an automatic "quality guard".* --- ## Main ways CI checks quality ### Building the project - checks that the code **actually builds** - catches compilation errors - checks dependencies This is the basic level of quality. --- ### Automated tests - unit tests - integration tests - e2e tests (sometimes) These verify that the code **works correctly** and does not break existing functionality. --- ### Linters and formatting - ESLint, flake8, golangci-lint, and so on - check style, potential errors, best practices They prevent bugs even **before the code runs**. --- ### Static code analysis - looks for: - vulnerabilities - leaks - duplication - overly complex logic It improves readability and maintainability. --- ### Test coverage checks - measures what portion of the code is covered by tests - there may be a minimum threshold (for example, 80%) This prevents test quality from slipping. --- ### Security checks - dependency scanning - vulnerability search - licenses These reduce risks in production. --- ## How CI affects the development process Usually: - if CI **fails**, the PR cannot be merged - if all checks are **green**, the code can be merged CI becomes a **mandatory quality filter**. --- ## What is important to say in an interview - CI **does not replace** code review - CI **automates routine work** - CI checks the code **on every change** --- ## Short answer for an interview > **CI checks code quality through automated builds, tests, linters, static analysis, and security checks, preventing changes with errors from reaching the main branch.**For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.