Add Quickstart test.

kms/pom.xml

@@ -72,8 +72,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.2</version>
         <configuration>
-          <source>5</source>
-          <target>5</target>
+          <source>7</source>
+          <target>7</target>
         </configuration>
       </plugin>
       <plugin>

kms/src/test/java/com/example/QuickstartIT.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2017 Google Inc.
+ *
+ * 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;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+/**
+ * Integration (system) tests for {@link Quickstart}.
+ */
+@RunWith(JUnit4.class)
+@SuppressWarnings("checkstyle:abbreviationaswordinname")
+public class QuickstartIT {
+
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  @BeforeClass
+  public static void setUpClass() throws Exception {
+    SnippetsIT.setUpClass();
+    ByteArrayOutputStream bout = new ByteArrayOutputStream();
+    PrintStream out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  /**
+   * Destroys all the keys created during this test run.
+   */
+  @AfterClass
+  public static void tearDownClass() throws Exception {
+    SnippetsIT.tearDownClass();
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+
+    Snippets.createCryptoKeyVersion(
+        SnippetsIT.PROJECT_ID, SnippetsIT.KEY_RING_ID, SnippetsIT.CRYPTO_KEY_ID);
+  }
+
+  @Test
+  public void listKeyRings_printsKeyRing() throws Exception {
+    Quickstart.main(SnippetsIT.PROJECT_ID);
+
+    assertThat(bout.toString()).contains(String.format("keyRings/%s", SnippetsIT.KEY_RING_ID));
+  }
+}