Unit test

According to Eden Treaty config and Unit Test, we may pass an Elysia instance to Eden Treaty directly to interact with the Elysia server directly without sending a network request.

We may use this pattern to create a unit test with end-to-end type safety and type-level tests all at once.

import { describe, expect, it } from 'bun:test'
import { Elysia } from 'elysia'
import { treaty } from '@elysia/eden'

const app = new Elysia().get('/hello', 'hi')
const api = treaty(app)

describe('Elysia', () => {
    it('returns a response', async () => {
        const { data } = await api.hello.get()

        expect(data).toBe('hi')

    })
})

Type safety test

Include your test folder in tsconfig.json, then run TypeScript with the project’s compiler options.

bunx tsc --noEmit

This is useful to ensure type integrity for both client and server, especially during migrations.