docs(samples): refactors the export to gcs sample (#821)

Author: b-loved-dreamer

speech/package.json

@@ -18,7 +18,11 @@
     "@google-cloud/speech": "^4.9.0",
     "@google-cloud/storage": "^5.0.0",
     "chalk": "^4.0.0",
+    "fs.promises": "^0.1.2",
+    "google-proto-files": "^2.5.0",
     "node-record-lpcm16": "^1.0.1",
+    "proto3-json-serializer": "^0.1.6",
+    "protobufjs": "^6.11.2",
     "sox": "^0.1.0",
     "yargs": "^16.0.0"
   },

speech/system-test/export-to-storage.v1p1beta1.test.js

@@ -50,7 +50,7 @@ describe('Speech-to-Text export to Cloud Storage ', () => {
 
   it('should export transcriptions', async () => {
     const stdout = execSync(
-      `node export-to-storage.v1p1beta1.js ${storageUri} ${outputStorageUri} ${encoding} ${sampleRateHertz} ${languageCode}`
+      `node export-to-storage.v1p1beta1.js ${storageUri} ${outputStorageUri} ${encoding} ${sampleRateHertz} ${languageCode} ${bucketName} ${bucketPrefix}`
     );
     assert.match(stdout, /Transcription/);
   });