---
title: Testing your Agents
description: Write and run tests for Cloudflare Agents using Vitest and the Workers test pool.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/agents/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Testing your Agents

Because Agents run on Cloudflare Workers and Durable Objects, they can be tested using the same tools and techniques as Workers and Durable Objects.

## Writing and running tests

### Setup

Note

The `agents-starter` template and new Cloudflare Workers projects already include the relevant `vitest` and `@cloudflare/vitest-pool-workers` packages, as well as a valid `vitest.config.js` file.

Before you write your first test, install the necessary packages:

Terminal window

```
npm install vitest@^4.1.0 @cloudflare/vitest-pool-workers --save-dev
```

Ensure that your `vitest.config.js` has the `cloudflareTest` plugin configured:

JavaScript

```
import { cloudflareTest } from "@cloudflare/vitest-pool-workers";import { defineConfig } from "vitest/config";
export default defineConfig({  plugins: [    cloudflareTest({      wrangler: { configPath: "./wrangler.jsonc" },    }),  ],});
```

### Write a test

Note

Review the [Vitest documentation ↗](https://vitest.dev/) for more information on testing, including the test API reference and advanced testing techniques.

Tests use the `vitest` framework. A basic test suite for your Agent can validate how your Agent responds to requests, but can also unit test your Agent's methods and state.

TypeScript

```
import { env, exports } from "cloudflare:workers";import {  createExecutionContext,  waitOnExecutionContext,} from "cloudflare:test";import { describe, it, expect } from "vitest";import worker from "../src";import { Env } from "../src";
interface ProvidedEnv extends Env {}
describe("make a request to my Agent", () => {  // Unit testing approach  it("responds with state", async () => {    // Provide a valid URL that your Worker can use to route to your Agent    // If you are using routeAgentRequest, this will be /agents/:agent/:name    const request = new Request<unknown, IncomingRequestCfProperties>(      "http://example.com/agents/my-agent/agent-123",    );    const ctx = createExecutionContext();    const response = await worker.fetch(request, env, ctx);    await waitOnExecutionContext(ctx);    expect(await response.json()).toEqual({ hello: "from your agent" });  });
  it("also responds with state", async () => {    const request = new Request("http://example.com/agents/my-agent/agent-123");    const response = await exports.default.fetch(request);    expect(await response.json()).toEqual({ hello: "from your agent" });  });});
```

### Run tests

Running tests is done using the `vitest` CLI:

Terminal window

```
npm run test# or run vitest directlynpx vitest
```

```
  MyAgent    ✓ should return a greeting (1 ms)
Test Files  1 passed (1)
```

Review the [documentation on testing](https://developers.cloudflare.com/workers/testing/vitest-integration/write-your-first-test/) for additional examples and test configuration.

## Running Agents locally

You can also run an Agent locally using the `wrangler` CLI:

Terminal window

```
npx wrangler dev
```

```
Your Worker and resources are simulated locally via Miniflare. For more information, see: https://developers.cloudflare.com/workers/testing/local-development.
Your worker has access to the following bindings:- Durable Objects:  - MyAgent: MyAgent  Starting local server...[wrangler:inf] Ready on http://localhost:53645
```

This spins up a local development server that runs the same runtime as Cloudflare Workers, and allows you to iterate on your Agent's code and test it locally without deploying it.

Visit the [wrangler dev ↗](https://developers.cloudflare.com/workers/wrangler/commands/general/#dev) docs to review the CLI flags and configuration options.

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