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

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

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

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

import { cloudflareTest } from "@cloudflare/vitest-pool-workers";
import { defineConfig } from "vitest/config";

export default defineConfig({
  plugins: [
    cloudflareTest({
      wrangler: { configPath: "./wrangler.jsonc" },
    }),
  ],
});

Write a test

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.

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:

npm run test
# or run vitest directly
npx vitest

  MyAgent
    ✓ should return a greeting (1 ms)

Test Files  1 passed (1)

Review the documentation on testing for additional examples and test configuration.

Running Agents locally

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

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 ↗ docs to review the CLI flags and configuration options.