Set up Vitest and CI workflow for unit tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Tests
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [22.x]
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: npm ci
+    - run: npm test

package.json

@@ -7,6 +7,8 @@
     "preview": "vite preview --port 5050",
     "lint": "eslint .",
     "lint-fix": "npm run lint -- --fix",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "cron": "node app/index.mjs cron",
     "start": "npm run sync:download && npm run splatnet:quick && npm run social && npm run cron",
     "social": "node app/index.mjs social",
@@ -65,6 +67,7 @@
     "tailwindcss": "^4.1.18",
     "typescript": "^5.9.3",
     "vite": "^7.3.1",
+    "vitest": "^4.0.18",
     "vue-eslint-parser": "^10.4.0"
   }
 }

vitest.config.mjs

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