Part 5: Testing

Deploy once per test file

import { expect } from "bun:test";
import * as Cloudflare from "@alchemy.run/cloudflare";
import * as Modal from "@alchemy.run/modal";
import * as Test from "@alchemy.run/test/Bun";
import * as Alchemy from "alchemy";
import * as Effect from "effect/Effect";
import * as HttpClient from "effect/http/HttpClient";
import * as HttpClientRequest from "effect/http/HttpClientRequest";
import * as Layer from "effect/Layer";
import Stack from "../alchemy.run.ts";

const { test, beforeAll, afterAll, deploy, destroy } = Test.make({
  providers: Layer.mergeAll(Cloudflare.providers(), Modal.providers()),
  state: Alchemy.localState(),
});

const stack = beforeAll(deploy(Stack));
afterAll.skipIf(!!process.env.NO_DESTROY)(destroy(Stack));

The test deploys the Stack to a stage of its own, with its own environment and images, and destroys it afterwards.

Check a sandbox sees the warm image and the user’s files

test(
  "starts each sandbox from the Warm image, with the user's files mounted",
  Effect.gen(function* () {
    const { url } = yield* stack;
    yield* Test.executeWhenReady(
      HttpClientRequest.put(`${url}/users/ada/files/notes.md`).pipe(HttpClientRequest.bodyText("hello")),
    );
    const res = yield* HttpClient.execute(
      HttpClientRequest.post(`${url}/users/ada/run`).pipe(
        HttpClientRequest.bodyText("pnpm --version && cat /home/user/notes.md"),
      ),
    );
    const body = (yield* res.json) as { exitCode: number; output: string };
    expect(body.exitCode).toBe(0);
    expect(body.output).toContain("hello");
  }),
  { timeout: 600_000 },
);

pnpm is only there if the sandbox booted from Warm, and hello only if it mounted Ada’s volume. Destroying the stage removes its environment, and the volumes in it.

Run it

bun test

bun test

bun test

bun test

Set NO_DESTROY=1 to keep the deployment, and its images, between runs while you iterate.

Next

Part 6 deploys more copies, from CI.