Refactor StorageSnippets and add integration tests for snippets

- Add script to append snippets to service interface
- Modify StorageSnippets class to make it testable
- Add profile for snippet testing
- Add integration tests for StorageSnippets

Author: mziccard

gcloud-java-examples/pom.xml

@@ -32,6 +32,12 @@
       <artifactId>maven-assembly-plugin</artifactId>
       <version>2.5.4</version>
     </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
   <build>
     <plugins>
@@ -103,6 +109,34 @@
           </programs>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-failsafe-plugin</artifactId>
+        <version>2.19.1</version>
+        <configuration>
+          <excludes>
+            <exclude>**/IT*Snippets.java</exclude>
+          </excludes>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
+  <profiles>
+    <profile>
+      <!-- We use the snippets profile to run snippets ITs -->
+      <id>snippets</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-failsafe-plugin</artifactId>
+            <version>2.19.1</version>
+            <configuration>
+              <excludes combine.self="override"></excludes>
+          </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
 </project>