Testing
Elysia.js exposes app.handle(request) — a single method that processes any Request object through the full middleware stack and returns a Response. Combined with Eden Treaty, Elysia's type-safe fetch client, you get end-to-end type checking from route definition all the way through the test
Testing
Bun workspaces let you run tests across every package in a monorepo with a single command. Cross-package imports resolve through the workspace protocol, TypeScript paths work without a build step, and bun test --filter targets packages by name pattern — making the monorepo test loop almost as fast as a
Testing
Bun.serve creates HTTP servers in a single function call. Testing them is equally direct: pass a Request object to the same handler function used by the server, or bind to a real port and use Bun's native fetch — no test superagent, no supertest, no http.createServer plumbing.
Testing
Bun ships a native SQLite driver (bun:sqlite) that creates in-memory databases in microseconds. This makes it practical to spin up a fully migrated, seeded database in beforeEach, run tests against real SQL, and discard the database after — no mocking, no Docker, no external process. Key Takeaways In-memory
Testing
Bun ships a built-in test runner (bun:test) that is Jest-compatible by design. It runs TypeScript natively, starts in milliseconds, and covers the full testing surface — matchers, snapshots, mocks, module mocking, and watch mode — without any additional dependencies. Key Takeaways bun:test is Jest-compatible. Most Jest tests
Testing
Jest is fast enough — until it isn't. Once your test suite crosses a few hundred tests, you start feeling it: the five-second startup, the transform overhead, the config file that has evolved into something no one fully understands. Bun's built-in test runner is a