Add samples for Data Catalog lookupEntry

.kokoro/datacatalog/cloud-client/lookup-entry.cfg

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+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Set the folder in which the tests are run
+env_vars: {
+    key: "PROJECT"
+    value: "datacatalog/cloud-client"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/nodejs-docs-samples/.kokoro/build.sh"
+}
+
+# Specify the project that contains a valid dataset.
+env_vars: {
+	key: "GCLOUD_PROJECT"
+	value: "bigquery-public-data"
+}
+
+# Specify the dataset related to the project.
+env_vars: {
+	key: "GCLOUD_DATASET_ID"
+	value: "new_york_taxi_trips"
+}

datacatalog/cloud-client/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 Data Catalog API Node.js Samples
+
+This directory contains samples for Google Cloud Data Catalog. Google Cloud Data Catalog is a fully managed and scalable metadata management service that empowers organizations to quickly discover, manage, and understand all their data in Google Cloud.
+
+# Setup
+
+Run the following command to install the library dependencies for Node.js:
+
+    npm install
+
+# Running the sample
+
+    Commands:
+        lookupEntry.js <projectId> <datasetId>                                  Lookup a dataset entry.
+
+
+For more information, see https://cloud.google.com/data-catalog/docs/

datacatalog/cloud-client/lookupEntry.js

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * 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';
+
+/**
+ * This application demonstrates how to perform lookup operations with the
+ * Cloud Data Catalog API.
+
+ * For more information, see the README.md under /datacatalog and the
+ * documentation at https://cloud.google.com/data-catalog/docs.
+ */
+function main(
+  projectId = process.env.GCLOUD_PROJECT,
+  datasetId = process.env.GCLOUD_DATASET_ID
+) {
+  // [START datacatalog_lookup_dataset]
+  // -------------------------------
+  // Import required modules.
+  // -------------------------------
+  const {DataCatalogClient} = require('@google-cloud/datacatalog').v1beta1;
+  const datacatalog = new DataCatalogClient();
+
+  async function lookup() {
+    // TODO(developer): Uncomment the following lines before running the sample.
+    // const projectId = 'my-project'
+    // const datasetId = 'my_dataset'
+    const resourceName = `//bigquery.googleapis.com/projects/${projectId}/datasets/${datasetId}`;
+    const request = {linkedResource: resourceName};
+    const [result] = await datacatalog.lookupEntry(request);
+    return result;
+  }
+
+  lookup().then(response => {
+    console.log(response);
+  });
+  // [END datacatalog_lookup_dataset]
+}
+
+// node lookupEntry.js <projectId> <datasetID>
+main(...process.argv.slice(2));

datacatalog/cloud-client/package.json

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+{
+  "name": "@google-cloud/datacatalog-samples",
+  "version": "0.0.1",
+  "private": true,
+  "description": "Samples for the Cloud Data Catalog client library for Node.js",
+  "license": "Apache-2.0",
+  "author": "Google LLC",
+  "repository": "GoogleCloudPlatform/nodejs-docs-samples",
+  "engines": {
+    "node": ">=8.0.0"
+  },
+  "scripts": {
+    "test": "mocha system-test/*.test.js --timeout=60000"
+  },
+  "devDependencies": {
+    "@google-cloud/nodejs-repo-tools": "^3.3.0",
+    "mocha": "^6.0.0"
+  },
+  "dependencies": {
+    "@google-cloud/datacatalog": "^1.0.1"
+  },
+  "cloud-repo-tools": {
+    "requiresKeyFile": true,
+    "requiresProjectId": true,
+    "test": {
+      "build": {
+        "requiredEnvVars": [
+          "GCLOUD_PROJECT",
+          "GCLOUD_DATASET_ID"
+        ]
+      }
+    }
+  }
+}

datacatalog/cloud-client/system-test/datacatalog.test.js

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * 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 path = require('path');
+const assert = require('assert');
+const tools = require('@google-cloud/nodejs-repo-tools');
+
+const cwd = path.join(__dirname, '..');
+const projectId = process.env.GCLOUD_PROJECT;
+const datasetId = process.env.GCLOUD_DATASET_ID;
+
+before(tools.checkCredentials);
+
+it('should lookup a dataset entry', async () => {
+  const output = await tools.runAsync(
+    `node lookupEntry.js ${projectId} ${datasetId}`,
+    cwd
+  );
+  const expectedLinkedResource = `//bigquery.googleapis.com/projects/${projectId}/datasets/${datasetId}`;
+  assert.ok(output.includes(expectedLinkedResource));
+});