Bun Test Configuration

Set up Bun's built-in test runner with Jest-compatible APIs and significantly faster execution (3-10x faster than Jest).

What's new in Bun 1.4

• --parallel — run tests in parallel across CPU cores (1.3.13)
• --isolate — run each test file in its own process (1.3.13)
• --shard — split test suite across CI runners (1.3.13)
• --changed — run only tests affected by changed files (1.3.13)
• --grep — filter tests by name pattern (1.3.6)
• --only-failures / --rerun-failures — rerun only failing tests (1.3.1)
• retry / repeats — per-test retry and repeat (1.3.9)
• Fake timers — useFakeTimers() for time-dependent tests (1.3.4)
• vi global — global vi mock function (1.3.1)
• onTestFinished hook — post-test assertions (1.3.2)
• --pass-with-no-tests — don't fail when no tests match (1.3.1)
• JUnit XML output — --reporter=junit (1.3.13)