vitest/require-test-timeout

A test without its own timeout gets the default, which is 5 seconds unless your config changes it. That's a long wait when a unit test hangs, and it's too short for a test that starts a server, which then fails now and then on a slow machine.

Set the timeout as a number after the test function, as { timeout } in the options before it, or for all the tests below with vi.setConfig({ testTimeout }).

Tests marked .skip or .todo aren't checked.

Configure

Off by default. To turn it on:

[lint.rules]
"vitest/require-test-timeout" = "error" # or "warn"

Examples

Reported:

import { expect, test } from "vitest";

test("loads the report", async () => {
  expect(await loadReport()).toBeDefined();
});

Not reported:

import { expect, test } from "vitest";

test("loads the report", async () => {
  expect(await loadReport()).toBeDefined();
}, 10_000);

test("exports the report", { timeout: 30_000 }, async () => {
  expect(await exportReport()).toBeDefined();
});

import { expect, test, vi } from "vitest";

vi.setConfig({ testTimeout: 10_000 });

test("loads the report", async () => {
  expect(await loadReport()).toBeDefined();
});

The timeout must be written as a number that isn't negative. A variable is reported, and so are options without timeout:

import { test } from "vitest";

const SLOW = 30_000;

test("exports the report", async () => {
  await exportReport();
}, SLOW);

test("prints the report", { retry: 2 }, async () => {
  await printReport();
});

When not to use it

If the default timeout, or the testTimeout in your Vitest config, suits all your tests, a number on each test adds nothing.