New quickstarts. (#226)

* New quickstarts.

* Address comments.

packages/google-cloud-dns/samples/README.md

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+<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google Cloud Platform logo" title="Google Cloud Platform" align="right" height="96" width="96"/>
+
+# Google Cloud DNS Node.js Samples
+
+Publish your domain names using Google's infrastructure for production-quality,
+high-volume DNS services. Google's global network of anycast name servers
+provide reliable, low-latency authoritative name lookups for your domains from
+anywhere in the world. Read more about [Google Cloud DNS][dns_docs].
+
+[dns_docs]: https://cloud.google.com/dns/docs
+
+## Table of Contents
+
+* [Setup](#setup)
+* [Samples](#samples)
+  * [Zones](#zones)
+
+## Setup
+
+1. Read [Prerequisites][prereq] and [How to run a sample][run] first.
+1. Install dependencies:
+
+        npm install
+
+[prereq]: ../README.md#prerequisities
+[run]: ../README.md#how-to-run-a-sample
+
+## Samples
+
+### Zones
+
+View the [documentation][zones_docs] or the [source code][zones_code].
+
+__Usage:__ `node zones --help`
+
+```
+Commands:
+  list  Lists all zones in the current project.
+
+Options:
+  --help  Show help                                                                                            [boolean]
+
+Examples:
+  node zones list  Lists all zones in the current project.
+
+For more information, see https://cloud.google.com/dns/docs
+```
+
+[zones_docs]: https://cloud.google.com/dns/docs
+[zones_code]: zones.js

packages/google-cloud-dns/samples/package.json

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+{
+  "name": "nodejs-docs-samples-dns",
+  "version": "0.0.1",
+  "private": true,
+  "license": "Apache Version 2.0",
+  "author": "Google Inc.",
+  "scripts": {
+    "test": "mocha -R spec -t 120000 --require intelli-espower-loader ../test/_setup.js test/*.test.js",
+    "system-test": "mocha -R spec -t 120000 --require intelli-espower-loader ../system-test/_setup.js system-test/*.test.js"
+  },
+  "dependencies": {
+    "@google-cloud/dns": "^0.2.0",
+    "yargs": "^6.0.0"
+  },
+  "devDependencies": {
+    "mocha": "^3.1.0",
+    "uuid": "^2.0.3"
+  },
+  "engines": {
+    "node": ">=4.3.2"
+  }
+}

packages/google-cloud-dns/samples/quickstart.js

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+/**
+ * Copyright 2016, 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.
+ */
+
+'use strict';
+
+// [START dns_quickstart]
+// Imports the Google Cloud client library
+const DNS = require('@google-cloud/dns');
+
+// Your Google Cloud Platform project ID
+const projectId = 'YOUR_PROJECT_ID';
+
+// Instantiates a client
+const dnsClient = DNS({
+  projectId: projectId
+});
+
+// Lists all zones in the current project
+dnsClient.getZones((err, zones) => {
+  if (err) {
+    console.error(err);
+    return;
+  }
+
+  console.log('Zones:');
+  zones.forEach((zone) => console.log(zone.name));
+});
+// [END dns_quickstart]

packages/google-cloud-dns/samples/test/quickstart.test.js

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+/**
+ * Copyright 2016, 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.
+ */
+
+'use strict';
+
+const proxyquire = require(`proxyquire`).noCallThru();
+
+describe(`dns:quickstart`, () => {
+  let dnsMock, DNSMock;
+  const error = new Error(`error`);
+
+  before(() => {
+    dnsMock = {
+      getZones: sinon.stub().yields(error)
+    };
+    DNSMock = sinon.stub().returns(dnsMock);
+  });
+
+  it(`should handle error`, () => {
+    proxyquire(`../quickstart`, {
+      '@google-cloud/dns': DNSMock
+    });
+
+    assert.equal(DNSMock.calledOnce, true);
+    assert.deepEqual(DNSMock.firstCall.args, [{ projectId: 'YOUR_PROJECT_ID' }]);
+    assert.equal(dnsMock.getZones.calledOnce, true);
+    assert.deepEqual(dnsMock.getZones.firstCall.args.slice(0, -1), []);
+    assert.equal(console.error.calledOnce, true);
+    assert.deepEqual(console.error.firstCall.args, [error]);
+  });
+});