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Install Bun

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Getting Started

Test runner Writing tests Test configuration

Test Execution

Runtime behavior Finding tests

Test Features

Lifecycle hooks Mocks Snapshots Dates and times

Specialized Testing

Reporting

Code coverage Test Reporters

Getting Started

Test runner

Bun's fast, built-in, Jest-compatible test runner with TypeScript support, lifecycle hooks, mocking, and watch mode

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NextWriting tests

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Run tests CI/CD integration GitHub Actions How to install bun in a GitHub Actions workflow JUnit XML reports (GitLab, etc.)Timeouts Concurrent test execution --concurrent flag --max-concurrency flag test.concurrent test.serial Retry failed tests Rerun tests Randomize test execution order Reproducible random order with --seed Bail out with --bail Watch mode Lifecycle hooks Mocks Snapshot testing UI & DOM testing Performance AI Agent Integration Environment Variables Behavior Execution Control Test Filtering Reporting Coverage Snapshots Examples