web: move to vitest

README.md

@@ -24,11 +24,12 @@ npm install
 npm run dev         # http://localhost:3000
 npm run codegen     # regenerate GraphQL types (needs the backend running)
 npm run build
+npm test            # vitest (npm run test:watch for watch mode)
 ```
 
 ## Pre-commit hooks
 
-[prek](https://github.com/j178/prek) runs ruff lint + format on `dnscms/**/*.py` plus a few sanity hooks. Hooks are configured in [prek.toml](prek.toml).
+[prek](https://github.com/j178/prek) runs ruff lint + format on `dnscms/**/*.py`, vitest on `web/` changes, plus a few sanity hooks. Hooks are configured in [prek.toml](prek.toml).
 
 ```bash
 prek install            # registers the git hook

prek.toml

@@ -27,3 +27,14 @@ exclude = '/migrations/'
 id = "ruff-format"
 files = '^dnscms/.*\.py$'
 exclude = '/migrations/'
+
+[[repos]]
+repo = "local"
+
+[[repos.hooks]]
+id = "vitest"
+name = "vitest"
+entry = "npm --prefix web test"
+language = "system"
+files = '^web/(src/.*\.(ts|tsx)|package\.json|vitest\.config\.mts)$'
+pass_filenames = false

web/package.json

@@ -7,7 +7,8 @@
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
-    "test": "node --test src/lib/*.test.ts",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "codegen": "graphql-codegen",
     "perf:build": "next build",
     "perf:serve": "next start -p 3100",
@@ -45,6 +46,7 @@
     "eslint-config-next": "16.2.10",
     "lighthouse": "^13.4.0",
     "typescript": "^6",
+    "vitest": "^4.1.10",
     "wait-on": "^9.0.10"
   },
   "overrides": {

web/src/lib/revalidation.test.ts

@@ -1,24 +1,23 @@
-import assert from "node:assert/strict";
-import { test } from "node:test";
+import { expect, test } from "vitest";
 
 import { secondsUntilOsloMidnight } from "./revalidation.ts";
 
 test("normal day: 12:00 CEST is 12h from midnight", () => {
   const now = new Date("2026-07-07T10:00:00Z");
-  assert.equal(secondsUntilOsloMidnight(now), 12 * 3600);
+  expect(secondsUntilOsloMidnight(now)).toBe(12 * 3600);
 });
 
 test("clamps to 60s just before midnight", () => {
   const now = new Date("2026-07-07T21:59:30Z");
-  assert.equal(secondsUntilOsloMidnight(now), 60);
+  expect(secondsUntilOsloMidnight(now)).toBe(60);
 });
 
 test("DST fall-back day is 25h (2026-10-25)", () => {
   const now = new Date("2026-10-24T22:00:00Z");
-  assert.equal(secondsUntilOsloMidnight(now), 25 * 3600);
+  expect(secondsUntilOsloMidnight(now)).toBe(25 * 3600);
 });
 
 test("DST spring-forward day is 23h (2026-03-29)", () => {
   const now = new Date("2026-03-28T23:00:00Z");
-  assert.equal(secondsUntilOsloMidnight(now), 23 * 3600);
+  expect(secondsUntilOsloMidnight(now)).toBe(23 * 3600);
 });

web/vitest.config.mts

@@ -0,0 +1,13 @@
+import { fileURLToPath } from "node:url";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["src/**/*.test.{ts,tsx}"],
+  },
+  resolve: {
+    alias: {
+      "@": fileURLToPath(new URL("./src", import.meta.url)),
+    },
+  },
+});