New quickstarts. (#226)

* New quickstarts.

* Address comments.

cloud-language/snippets/package.json

@@ -16,5 +16,8 @@
   "devDependencies": {
     "mocha": "^3.0.2",
     "node-uuid": "^1.4.7"
+  },
+  "engines": {
+    "node": ">=4.3.2"
   }
 }

cloud-language/snippets/quickstart.js

@@ -0,0 +1,43 @@
+/**
+ * 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 language_quickstart]
+// Imports the Google Cloud client library
+const Language = require('@google-cloud/language');
+
+// Your Google Cloud Platform project ID
+const projectId = 'YOUR_PROJECT_ID';
+
+// Instantiates a client
+const languageClient = Language({
+  projectId: projectId
+});
+
+// The text to analyze
+const text = 'Hello, world!';
+
+// Detects the sentiment of the text
+languageClient.detectSentiment(text, { verbose: true }, (err, sentiment) => {
+  if (err) {
+    console.error(err);
+    return;
+  }
+
+  console.log('Text: %s', text);
+  console.log('Sentiment: %j', sentiment);
+});
+// [END language_quickstart]

cloud-language/snippets/system-test/quickstart.test.js

@@ -0,0 +1,51 @@
+/**
+ * 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`).noPreserveCache();
+const language = proxyquire(`@google-cloud/language`, {})();
+
+describe(`language:quickstart`, () => {
+  let languageMock, LanguageMock;
+
+  it(`should detect sentiment`, (done) => {
+    const expectedText = `Hello, world!`;
+
+    languageMock = {
+      detectSentiment: (_text, _config, _callback) => {
+        assert.equal(_text, expectedText);
+        assert.deepEqual(_config, { verbose: true });
+        assert.equal(typeof _callback, 'function');
+
+        language.detectSentiment(_text, _config, (err, sentiment, apiResponse) => {
+          _callback(err, sentiment, apiResponse);
+          assert.ifError(err);
+          assert.equal(typeof sentiment, 'object');
+          assert.notEqual(apiResponse, undefined);
+          assert.equal(console.log.calledTwice, true);
+          assert.deepEqual(console.log.firstCall.args, [`Text: %s`, expectedText]);
+          assert.deepEqual(console.log.secondCall.args, [`Sentiment: %j`, sentiment]);
+          done();
+        });
+      }
+    };
+    LanguageMock = sinon.stub().returns(languageMock);
+
+    proxyquire(`../quickstart`, {
+      '@google-cloud/language': LanguageMock
+    });
+  });
+});

cloud-language/snippets/test/quickstart.test.js

@@ -0,0 +1,44 @@
+/**
+ * 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(`language:quickstart`, () => {
+  let languageMock, LanguageMock;
+  const error = new Error(`error`);
+  const text = 'Hello, world!';
+
+  before(() => {
+    languageMock = {
+      detectSentiment: sinon.stub().yields(error)
+    };
+    LanguageMock = sinon.stub().returns(languageMock);
+  });
+
+  it(`should handle error`, () => {
+    proxyquire(`../quickstart`, {
+      '@google-cloud/language': LanguageMock
+    });
+
+    assert.equal(LanguageMock.calledOnce, true);
+    assert.deepEqual(LanguageMock.firstCall.args, [{ projectId: 'YOUR_PROJECT_ID' }]);
+    assert.equal(languageMock.detectSentiment.calledOnce, true);
+    assert.deepEqual(languageMock.detectSentiment.firstCall.args.slice(0, -1), [text, { verbose: true }]);
+    assert.equal(console.error.calledOnce, true);
+    assert.deepEqual(console.error.firstCall.args, [error]);
+  });
+});