diff --git a/functions/helloworld/test/sample.system.http.test.js b/functions/helloworld/test/sample.system.http.test.js
index 7926a6a66e..91362e9984 100644
--- a/functions/helloworld/test/sample.system.http.test.js
+++ b/functions/helloworld/test/sample.system.http.test.js
@@ -18,6 +18,10 @@ const Supertest = require('supertest');
 const supertest = Supertest(process.env.BASE_URL);
 const childProcess = require('child_process');
 
+if (!process.env.GCF_REGION) {
+  throw new Error('"GCF_REGION" env var must be set.');
+}
+
 describe('system tests', () => {
   // [END functions_http_system_test]
   before(() => {
@@ -28,7 +32,7 @@ describe('system tests', () => {
 
   after(() => {
     childProcess.execSync(
-      `gcloud functions delete helloHttp --region=${process.env.GCF_REGION}`
+      `gcloud functions delete helloHttp --region=${process.env.GCF_REGION} --quiet`
     );
   });
   // [START functions_http_system_test]
diff --git a/functions/helloworld/test/sample.system.pubsub.test.js b/functions/helloworld/test/sample.system.pubsub.test.js
index d0b435c34a..6ebc327db5 100644
--- a/functions/helloworld/test/sample.system.pubsub.test.js
+++ b/functions/helloworld/test/sample.system.pubsub.test.js
@@ -22,6 +22,10 @@ const promiseRetry = require('promise-retry');
 
 const pubsub = new PubSub();
 const topicName = process.env.FUNCTIONS_TOPIC;
+if (!topicName) throw new Error('"FUNCTION_TOPIC" env var must be set.');
+if (!process.env.GCF_REGION) {
+  throw new Error('"GCF_REGION" env var must be set.');
+}
 const baseCmd = 'gcloud functions';
 
 describe('system tests', () => {
@@ -34,7 +38,7 @@ describe('system tests', () => {
 
   after(() => {
     childProcess.execSync(
-      `gcloud functions delete helloPubSub --region=${process.env.GCF_REGION}`
+      `gcloud functions delete helloPubSub --region=${process.env.GCF_REGION} --quiet`
     );
   });
   // [START functions_pubsub_system_test]
diff --git a/functions/helloworld/test/sample.system.storage.test.js b/functions/helloworld/test/sample.system.storage.test.js
index e57729d1dc..49b1c82b3c 100644
--- a/functions/helloworld/test/sample.system.storage.test.js
+++ b/functions/helloworld/test/sample.system.storage.test.js
@@ -27,6 +27,12 @@ const gcsFileName = `test-${uuid.v4()}.txt`;
 
 const localFileName = 'test.txt';
 const bucketName = process.env.FUNCTIONS_DELETABLE_BUCKET;
+if (!bucketName) {
+  throw new Error('"FUNCTION_DELETABLE_BUCKET" env var must be set.');
+}
+if (!process.env.GCF_REGION) {
+  throw new Error('"GCF_REGION" env var must be set.');
+}
 const bucket = storage.bucket(bucketName);
 const baseCmd = 'gcloud functions';
 
@@ -40,7 +46,7 @@ describe('system tests', () => {
 
   after(() => {
     childProcess.execSync(
-      `gcloud functions delete helloGCS --region=${process.env.GCF_REGION}`
+      `gcloud functions delete helloGCS --region=${process.env.GCF_REGION} --quiet`
     );
   });
   // [START functions_storage_system_test]