Add tests for Cloud Tasks app engine targets (GoogleCloudPlatform#1493)

* Add tests for cloud tasks app engine targets

* Update env variable

* Update queue location

* Clean up tests

* add scope to test dep

Author: averikitsch

.kokoro/tests/run_tests.sh

@@ -53,6 +53,8 @@ if [[ "$SCRIPT_DEBUG" != "true" ]]; then
     # Setup required env variables
     export GOOGLE_CLOUD_PROJECT=java-docs-samples-testing
     export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-acct.json
+    export QUEUE_ID=my-appengine-queue
+    export LOCATION_ID=us-east1
     source "${KOKORO_GFILE_DIR}/aws-secrets.sh"
     source "${KOKORO_GFILE_DIR}/storage-hmac-credentials.sh"
     source "${KOKORO_GFILE_DIR}/dlp_secrets.txt"

appengine-java11/tasks/pom.xml

@@ -45,10 +45,22 @@ Copyright 2019 Google LLC
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-tasks</artifactId>
-      <version>1.6.0</version>
-      <scope>provided</scope>
+      <version>1.3.0</version>
     </dependency>
     <!-- [END gae_java11_task_pom] -->
+    <!-- Test dependencies -->
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13-beta-2</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.google.truth</groupId>
+      <artifactId>truth</artifactId>
+      <version>0.44</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

appengine-java11/tasks/src/main/java/com/example/task/CreateTask.java

@@ -29,11 +29,11 @@
 import java.time.Instant;
 
 public class CreateTask {
-  public static void main(String[] args) throws Exception {
+  public static void main(String... args) throws Exception {
     // Instantiates a client.
     try (CloudTasksClient client = CloudTasksClient.create()) {
       // Variables provided by system variables.
-      String projectId = System.getenv("PROJECT_ID");
+      String projectId = System.getenv("GOOGLE_CLOUD_PROJECT");
       String queueName = System.getenv("QUEUE_ID");
       String location = System.getenv("LOCATION_ID");
       // Optional variables.

appengine-java11/tasks/src/test/java/com/example/task/CreateTaskIT.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2019 Google LLC
+ *
+ * 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.
+ */
+
+package com.example.task;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.Timeout;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for creating Tasks with App Engine targets. */
+@RunWith(JUnit4.class)
+public class CreateTaskIT {
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testCreateTask() throws Exception {
+    CreateTask.main();
+    String got = bout.toString();
+    assertThat(got).contains("Task created:");
+  }
+}