diff --git a/functions/node8/package.json b/functions/node8/package.json
index 1d786a3470..665830e98e 100644
--- a/functions/node8/package.json
+++ b/functions/node8/package.json
@@ -3,8 +3,12 @@
   "version": "0.0.1",
   "description": "Google Cloud Functions samples for Node.js 8",
   "scripts": {
+    "pretest": "semistandard *.js test/*.js",
+    "test": "ava test/*"
+  },
+  "engines": {
+    "node": "^8"
   },
-  "engines": { "node": "^8"},
   "repository": {
     "type": "git",
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
@@ -13,5 +17,11 @@
   "license": "Apache-2.0",
   "bugs": {
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples/issues"
+  },
+  "dependencies": {
+    "ava": "^0.25.0"
+  },
+  "devDependencies": {
+    "semistandard": "^12.0.1"
   }
 }
diff --git a/functions/node8/test/sample.unit.pubsub.test.js b/functions/node8/test/sample.unit.pubsub.test.js
new file mode 100644
index 0000000000..d85f9e55cd
--- /dev/null
+++ b/functions/node8/test/sample.unit.pubsub.test.js
@@ -0,0 +1,44 @@
+/**
+ * Copyright 2018, Google, Inc.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// [START functions_pubsub_unit_test]
+const test = require(`ava`);
+const uuid = require(`uuid`);
+const sinon = require(`sinon`);
+
+const helloPubSub = require(`..`).helloPubSub;
+const consoleLog = sinon.stub(console, 'log');
+
+test(`helloPubSub: should print a name`, async t => {
+  // Initialize mocks
+  const name = uuid.v4();
+  const event = {
+    data: Buffer.from(name).toString(`base64`)
+  };
+
+  // Call tested function and verify its behavior
+  await helloPubSub(event);
+  t.true(consoleLog.calledWith(`Hello, ${name}!`));
+});
+
+test(`helloPubSub: should print hello world`, async t => {
+  // Initialize mocks
+  const event = {};
+
+  // Call tested function and verify its behavior
+  await helloPubSub(event);
+  t.true(consoleLog.calledWith(`Hello, World!`));
+});
+// [END functions_pubsub_unit_test]
diff --git a/functions/node8/test/sample.unit.storage.test.js b/functions/node8/test/sample.unit.storage.test.js
new file mode 100644
index 0000000000..595c6dff7f
--- /dev/null
+++ b/functions/node8/test/sample.unit.storage.test.js
@@ -0,0 +1,65 @@
+/**
+ * Copyright 2018, Google, Inc.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// [START functions_storage_unit_test]
+const test = require(`ava`);
+const uuid = require(`uuid`);
+const sinon = require(`sinon`);
+
+const helloGCS = require(`..`).helloGCS;
+const consoleLog = sinon.stub(console, 'log');
+
+test(`helloGCS: should print uploaded message`, async t => {
+  // Initialize mocks
+  const filename = uuid.v4();
+  const event = {
+    name: filename,
+    resourceState: 'exists',
+    metageneration: '1'
+  };
+
+  // Call tested function and verify its behavior
+  await helloGCS(event);
+  t.true(consoleLog.calledWith(`File ${filename} uploaded.`));
+});
+
+test(`helloGCS: should print metadata updated message`, async t => {
+  // Initialize mocks
+  const filename = uuid.v4();
+  const event = {
+    name: filename,
+    resourceState: 'exists',
+    metageneration: '2'
+  };
+
+  // Call tested function and verify its behavior
+  await helloGCS(event);
+  t.true(consoleLog.calledWith(`File ${filename} metadata updated.`));
+});
+
+test(`helloGCS: should print deleted message`, async t => {
+  // Initialize mocks
+  const filename = uuid.v4();
+  const event = {
+    name: filename,
+    resourceState: 'not_exists',
+    metageneration: '3'
+  };
+
+  // Call tested function and verify its behavior
+  await helloGCS(event);
+  t.true(consoleLog.calledWith(`File ${filename} deleted.`));
+});
+// [END functions_storage_unit_test]