Implement Closeable on MockWebServer.

Enables use via try-with-resources.

mockwebserver/src/main/java/okhttp3/mockwebserver/MockWebServer.java

@@ -17,6 +17,7 @@
 
 package okhttp3.mockwebserver;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.io.InterruptedIOException;
 import java.net.InetAddress;
@@ -99,7 +100,7 @@ import static okhttp3.mockwebserver.SocketPolicy.UPGRADE_TO_SSL_AT_END;
  * A scriptable web server. Callers supply canned responses and the server replays them upon request
  * in sequence.
  */
-public final class MockWebServer implements TestRule {
+public final class MockWebServer implements TestRule, Closeable {
   static {
     Internal.initializeInstanceForTests();
   }
@@ -807,6 +808,10 @@ public final class MockWebServer implements TestRule {
     return "MockWebServer[" + port + "]";
   }
 
+  @Override public void close() throws IOException {
+    shutdown();
+  }
+
   /** A buffer wrapper that drops data after {@code bodyLimit} bytes. */
   private static class TruncatingBuffer implements Sink {
     private final Buffer buffer = new Buffer();

mockwebserver/src/test/java/okhttp3/mockwebserver/MockWebServerTest.java

@@ -16,6 +16,7 @@
 package okhttp3.mockwebserver;
 
 import java.io.BufferedReader;
+import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -339,6 +340,11 @@ public final class MockWebServerTest {
     server.shutdown();
   }
 
+  @Test public void closeViaClosable() throws IOException {
+    Closeable server = new MockWebServer();
+    server.close();
+  }
+
   @Test public void shutdownWithoutEnqueue() throws IOException {
     MockWebServer server = new MockWebServer();
     server.start();