ElysiaJS

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Unit Test ​

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

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

typescript
// test/index.test.ts
import { describe, expect, it } from 'bun:test'
import { Elysia } from 'elysia'
import { treaty } from '@elysiajs/eden'

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

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

        expect(data).toBe('hi')
    })
})
// test/index.test.ts
import { describe, expect, it } from 'bun:test'
import { Elysia } from 'elysia'
import { treaty } from '@elysiajs/eden'

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

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

        expect(data).toBe('hi')
    })
})

Type safety test ​

To perform a type safety test, simply run tsc to test folders.

bash
tsc --noEmit test/**/*.ts
tsc --noEmit test/**/*.ts

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