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

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> 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.

# Testing your Agents

Last updated Aug 25, 2026|Copy as Markdown|[View as Markdown](https://4f1c5cd2.previews.developers.cloudflare.com/agents/getting-started/testing-your-agent/index.md)|[Agent setup](https://4f1c5cd2.previews.developers.cloudflare.com/agent-setup/)

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-plugin` packages, as well as a valid `vitest.config.js` file.

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

```sh
npm install vitest@^4.1.0 @cloudflare/vitest-plugin --save-dev
```

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

```js
import { cloudflareTest } from "@cloudflare/vitest-plugin";
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.

```ts
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:

```sh
npm run test
# or run vitest directly
npx vitest
```

```txt
  MyAgent
    ✓ should return a greeting (1 ms)

Test Files  1 passed (1)
```

Review the [documentation on testing](https://4f1c5cd2.previews.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:

```sh
npx wrangler dev
```

```txt
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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