Trying to add tests for the first time. Cursor installed vitest and wrote this: Then Cursor added import { JSDOM } from "jsdom" to the test and made a fake docu

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Question

Vitest: ReferenceError: document is not defined on my first component test

Solved · 175 views · asked last week by imani_w · edited

Trying to add tests for the first time. Cursor installed vitest and wrote this:

import { render, screen } from "@testing-library/react";
import { PriceTag } from "@/components/price-tag";

test("shows euro price", () => {
  render(<PriceTag cents={1250} />);
  expect(screen.getByText("€12.50")).toBeInTheDocument();
});

ReferenceError: document is not defined

Then Cursor added import { JSDOM } from "jsdom" to the test and made a fake document by hand, which feels very wrong.

What I’ve tried

Asked Cursor to fix it (the JSDOM thing), googled the error, found configs for Jest that don't apply.

Comment

Can you share the vitest config Cursor made? dmitri_v last week · edited

2 answers

Marked as helpful by the asker

dev_analast week · edited

Vitest runs in Node by default, which has no DOM. Tell it to use jsdom for everything, remove the hand-made JSDOM:

npm i -D jsdom @testing-library/jest-dom @vitejs/plugin-react vite-tsconfig-paths

// vitest.config.mts
import { defineConfig } from "vitest/config";
import react from "@vitejs/plugin-react";
import tsconfigPaths from "vite-tsconfig-paths";

export default defineConfig({
  plugins: [tsconfigPaths(), react()],
  test: { environment: "jsdom", setupFiles: ["./vitest.setup.ts"] },
});

// vitest.setup.ts
import "@testing-library/jest-dom/vitest";

The setup file is what makes toBeInTheDocument exist. tsconfigPaths makes the @/ import work.

One heads-up: async server components can't be rendered like this. Test those with Playwright.

Comment

Green! First test ever that passes for the right reason. imani_w last week · edited

Nice. Now write one that fails on purpose to see it catch something. dev_ana last week · edited

The /vitest suffix on the jest-dom import is the part everybody misses, good call. femi_o last week · edited

dmitri_vlast week · edited

If you only need the DOM in some files, you can also put // @vitest-environment jsdom at the top of that test file instead of setting it globally. Keeps your pure logic tests fast.

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