sample: Add quickstart sample code for BatchGetAsstesHistory. (#59)

asset/snippets/system-test/quickstart.test.js

@@ -18,7 +18,6 @@
 const assert = require('assert');
 const path = require('path');
 const tools = require('@google-cloud/nodejs-repo-tools');
-const util = require('util');
 const uuid = require('uuid');
 const cwd = path.join(__dirname, '..');
 const cmd = 'node quickstart.js';
@@ -29,20 +28,33 @@ const storage = new Storage();
 const bucketName = `asset-nodejs-${uuid.v4()}`;
 const bucket = storage.bucket(bucketName);
 
-describe('Quickstart sample tests', () => {
+describe('quickstart sample tests', () => {
+  before(tools.checkCredentials);
   before(async () => {
-    tools.checkCredentials();
     await bucket.create();
   });
 
-  after(async () => await bucket.delete());
+  after(async () => {
+    await bucket.delete();
+  });
 
   it('should export assets to specified path', async () => {
-    const dumpFilePath = util.format('gs://%s/my-assets.txt', bucketName);
+    const dumpFilePath = `gs://${bucketName}/my-assets.txt`;
     await tools.runAsyncWithIO(`${cmd} export-assets ${dumpFilePath}`, cwd);
     const file = await bucket.file('my-assets.txt');
-    const [exists] = await file.exists();
+    const exists = await file.exists();
     assert.ok(exists);
     await file.delete();
   });
+
+  it('should get assets history successfully', async () => {
+    const assetName = `//storage.googleapis.com/${bucketName}`;
+    const output = await tools.runAsyncWithIO(
+      `${cmd} batch-get-history ${assetName}`,
+      cwd
+    );
+    if (output.stdout) {
+      assert.ok(output.stdout.includes(assetName));
+    }
+  });
 });