Writing tests Test configuration Runtime behavior Finding tests Lifecycle hooks Mocks Snapshots Dates and times DOM testing Code coverage Test Reporters

Code coverage

Use Bun's built-in code coverage reporting to track test coverage and find untested code

DOM testing

Learn how to test DOM elements and components using Bun with happy-dom and React Testing Library

Test Reporters

bun test supports different output formats through reporters, both built-in and custom.

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Enabling Coverage Enable by Default Coverage Thresholds Simple Threshold Detailed Thresholds Coverage Reporters Available Reporters LCOV Coverage Reporter Using LCOV with GitHub Actions Excluding Files from Coverage Skip Test Files Ignore Specific Paths and Patterns Common Use Cases Sourcemaps Coverage Defaults Advanced Configuration Custom Coverage Directory Multiple Reporters Coverage with Specific Test Patterns CI/CD Integration GitHub Actions Example GitLab CI Example Interpreting Coverage Reports Text Output Explanation What to Aim For Best Practices Focus on Quality, Not Just Quantity Test Edge Cases Use Coverage to Find Missing Tests Combine with Other Quality Metrics Troubleshooting Coverage Not Showing for Some Files False Coverage Reports Performance Issues with Large Codebases