hono-testing

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---
name: hono-testing
description: Hono testing patterns - app.request(), test client, mocking environment, and integration testing strategies
user-invocable: false
disable-model-invocation: true
skill_version: 1.0.0
updated_at: 2025-01-03T00:00:00Z
tags: [hono, testing, vitest, jest, integration-testing, mocking]
progressive_disclosure:
  entry_point:
    summary: "Testing Hono apps with app.request(), typed test client, and environment mocking"
    when_to_use: "Writing unit and integration tests for Hono APIs"
    quick_start: "1. Create app instance 2. Use app.request() or testClient 3. Assert response"
  references: []
context_limit: 800
---

# Hono Testing Patterns

## Overview

Hono provides a simple testing approach: create a Request, pass it to your app, and validate the Response. The framework includes a typed test client for even better DX.

**Key Features**:
- Simple `app.request()` API
- Typed test client with full inference
- Environment mocking for Workers
- Works with Vitest, Jest, or any test runner

## When to Use This Skill

Use Hono testing when:
- Writing unit tests for route handlers
- Integration testing API endpoints
- Testing middleware behavior
- Mocking Cloudflare Workers bindings
- Validating request/response cycles

## Basic Testing

### Using app.request()

```typescript
import { Hono } from 'hono'
import { describe, it, expect } from 'vitest'

const app = new Hono()

app.get('/hello', (c) => c.text('Hello!'))
app.get('/json', (c) => c.json({ message: 'Hello' }))

describe('Basic routes', () => {
  it('should return text', async () => {
    const res = await app.request('/hello')

    expect(res.status).toBe(200)
    expect(await res.text()).toBe('Hello!')
  })

  it('should return JSON', async () => {
    const res = await app.request('/json')

    expect(res.status).toBe(200)
    expect(res.headers.get('Content-Type')).toContain('application/json')
    expect(await res.json()).toEqual({ message: 'Hello' })
  })
})
```

### Request Options

```typescript
// GET with query params
const res = await app.request('/search?q=hono&page=1')

// POST with JSON body
const res = await app.request('/users', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ name: 'Alice', email: '[email protected]' })
})

// POST with form data
const formData = new FormData()
formData.append('name', 'Alice')
formData.append('email', '[email protected]')

const res = await app.request('/users', {
  method: 'POST',
  body: formData
})

// With custom headers
const res = await app.request('/protected', {
  headers: {
    'Authorization': 'Bearer token123',
    'X-Custom-Header': 'value'
  }
})

// DELETE request
const res = await app.request('/users/123', {
  method: 'DELETE'
})
```

## Typed Test Client

The test client provides full type inference:

```typescript
import { Hono } from 'hono'
import { testClient } from 'hono/testing'
import { describe, it, expect } from 'vitest'

const app = new Hono()
  .get('/users', (c) => c.json({ users: [] }))
  .post('/users', async (c) => {
    const body = await c.req.json()
    return c.json({ id: '1', ...body }, 201)
  })
  .get('/users/:id', (c) => {
    return c.json({ id: c.req.param('id'), name: 'Alice' })
  })

describe('Users API', () => {
  const client = testClient(app)

  it('should list users', async () => {
    const res = await client.users.$get()

    expect(res.status).toBe(200)
    const data = await res.json()
    expect(data.users).toEqual([])
  })

  it('should create user', async () => {
    const res = await client.users.$post({
      json: { name: 'Alice', email: '[email protected]' }
    })

    expect(res.status).toBe(201)
    const data = await res.json()
    expect(data.name).toBe('Alice')
  })

  it('should get user by id', async () => {
    const res = await client.users[':id'].$get({
      param: { id: '123' }
    })

    expect(res.status).toBe(200)
    const data = await res.json()
    expect(data.id).to