Adds unit test workflow

Author: zachleat

.github/workflows/unit-tests.yml

@@ -0,0 +1,21 @@
+name: Unit Tests
+on: push
+permissions: read-all
+jobs:
+  vitest:
+    name: Vitest on ${{ matrix.os }} (Node.js v${{ matrix.node }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        node: ["20", "22", "24"]
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # 4.1.7
+      - name: Setup node
+        uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b # 4.0.3
+        with:
+          node-version: ${{ matrix.node }}
+      - run: npm ci
+      - run: npm run test
+env:
+  YARN_GPG: no

package.json

@@ -8,7 +8,7 @@
     "test": "vitest"
   },
   "engines": {
-		"node": ">=18"
+		"node": ">=20"
 	},
   "funding": {
 		"type": "opencollective",