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dev.test.ts
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dev.test.ts
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import crypto from "node:crypto";
import path from "node:path";
import { setTimeout } from "node:timers/promises";
import getPort from "get-port";
import shellac from "shellac";
import { fetch } from "undici";
import { beforeEach, describe, expect, it } from "vitest";
import { retry } from "./helpers/retry";
import { dedent, makeRoot, seed } from "./helpers/setup";
import { WRANGLER } from "./helpers/wrangler-command";
async function runDevSession(
workerPath: string,
flags: string,
session: (port: number) => Promise<void>
) {
let pid;
try {
const port = await getPort();
// Must use the `in` statement in the shellac script rather than `.in()` modifier on the `shellac` object
// otherwise the working directory does not get picked up.
const bg = await shellac.env(process.env).bg`
in ${workerPath} {
exits {
$ ${WRANGLER} dev ${flags} --port ${port}
}
}
`;
pid = bg.pid;
await session(port);
return bg.promise;
} finally {
if (pid) process.kill(pid);
}
}
describe("basic dev tests", () => {
let workerName: string;
let workerPath: string;
beforeEach(async () => {
const root = await makeRoot();
workerName = `smoke-test-worker-${crypto.randomBytes(4).toString("hex")}`;
workerPath = path.join(root, workerName);
await seed(workerPath, {
"wrangler.toml": dedent`
name = "${workerName}"
main = "src/index.ts"
compatibility_date = "2023-01-01"
[vars]
KEY = "value"
`,
"src/index.ts": dedent`
export default {
fetch(request) {
return new Response("Hello World!")
}
}`,
"package.json": dedent`
{
"name": "${workerName}",
"version": "0.0.0",
"private": true
}
`,
});
});
it("can modify worker during dev session (local)", async () => {
await runDevSession(workerPath, "", async (port) => {
const { text } = await retry(
(s) => s.status !== 200,
async () => {
const r = await fetch(`http://127.0.0.1:${port}`);
return { text: await r.text(), status: r.status };
}
);
expect(text).toMatchInlineSnapshot('"Hello World!"');
await seed(workerPath, {
"src/index.ts": dedent`
export default {
fetch(request, env) {
return new Response("Updated Worker! " + env.KEY)
}
}`,
});
const { text: text2 } = await retry(
(s) => s.status !== 200 || s.text === "Hello World!",
async () => {
const r = await fetch(`http://127.0.0.1:${port}`);
return { text: await r.text(), status: r.status };
}
);
expect(text2).toMatchInlineSnapshot('"Updated Worker! value"');
await seed(workerPath, {
"wrangler.toml": dedent`
name = "${workerName}"
main = "src/index.ts"
compatibility_date = "2023-01-01"
[vars]
KEY = "updated"
`,
});
const { text: text3 } = await retry(
(s) => s.status !== 200 || s.text === "Updated Worker! value",
async () => {
const r = await fetch(`http://127.0.0.1:${port}`);
return { text: await r.text(), status: r.status };
}
);
expect(text3).toMatchInlineSnapshot('"Updated Worker! updated"');
});
});
it("can modify worker during dev session (remote)", async () => {
await runDevSession(workerPath, "--remote --ip 127.0.0.1", async (port) => {
const { text } = await retry(
(s) => s.status !== 200 || s.text === "",
async () => {
const r = await fetch(`http://127.0.0.1:${port}`);
return { text: await r.text(), status: r.status };
}
);
expect(text).toMatchInlineSnapshot('"Hello World!"');
await seed(workerPath, {
"src/index.ts": dedent`
export default {
fetch(request) {
return new Response("Updated Worker!")
}
}`,
});
// Give a bit of time for the change to propagate.
// Otherwise the process has a tendency to hang.
await setTimeout(5000);
const { text: text2 } = await retry(
(s) => s.status !== 200 || s.text === "Hello World!",
async () => {
const r = await fetch(`http://127.0.0.1:${port}`);
return { text: await r.text(), status: r.status };
}
);
expect(text2).toMatchInlineSnapshot('"Updated Worker!"');
});
});
});