diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 58eca4f..2e6fd8f 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -16,10 +16,8 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
-      - name: npm install, lint, and test
+      - name: npm install and test
         run: |
           npm ci
           # npm run build
-          # npm test
-        env:
-          CI: true
+          npm test
diff --git a/README.md b/README.md
index 9f70cce..8718e3c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,17 @@
+# [Project Name]
+
+Boilerplate repo with:
+
+- MIT License
+- Node, npm
+- tests with the `node:test` built-in
+- formatting with prettier
+- GitHub Actions
+
 ## Requirements
 
-- Node 10
-- Yarn 1.x or npm
+- Node 20
+- npm v8+
 
 ## Setup
 
@@ -10,9 +20,7 @@
 
 ## npm scripts
 
-> Equivalent `npm run <script>` should also work
-
-- `yarn lint` will lint all of the files with [xo](https://github.com/xojs/xo)
+- `npm test` will run tests using the [Node.js test runner](https://nodejs.org/api/test.html#running-tests-from-the-command-line) and the `node:test` module.
 - `npm run format` will run prettier on all the examples files (and tests).
 
 ## LICENSE
diff --git a/package.json b/package.json
index 45f722a..4b7aee9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,8 @@
 {
   "private": true,
+  "type": "module",
   "scripts": {
+    "test": "node --test",
     "format": "prettier --write './**/*.{js,json,yml,md}'"
   },
   "license": "MIT",
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..7d65831
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,3 @@
+export function add(a, b) {
+  return a + b;
+}
diff --git a/src/index.test.js b/src/index.test.js
new file mode 100644
index 0000000..b0a4e1c
--- /dev/null
+++ b/src/index.test.js
@@ -0,0 +1,7 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { add } from "./index.js";
+
+test("add", () => {
+  assert.equal(add(1, 2), 3);
+});