diff --git a/package.json b/package.json
index 72b452d..b969653 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "license": "MIT",
   "repository": "juliangruber/node-core-test",
   "scripts": {
-    "test": "prettier-standard && standard"
+    "test": "prettier-standard && standard && node test"
   },
   "devDependencies": {
     "prettier-standard": "^16.4.1",
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..ca5a702
--- /dev/null
+++ b/test.js
@@ -0,0 +1,21 @@
+'use strict'
+
+const assert = require('assert')
+const test = require('.')
+
+test('synchronous passing test', t => {
+  // This test passes because it does not throw an exception.
+  assert.strictEqual(1, 1)
+})
+
+test('asynchronous passing test', async t => {
+  // This test passes because the Promise returned by the async
+  // function is not rejected.
+  assert.strictEqual(1, 1)
+})
+
+test('callback passing test', (t, done) => {
+  // done() is the callback function. When the setImmediate() runs, it invokes
+  // done() with no arguments.
+  setImmediate(done)
+})