JAVA-10238: Use random port in the integration test

libraries-rpc/src/test/java/com/baeldung/rpc/finagle/FinagleIntegrationTest.java

@@ -10,16 +10,23 @@ import com.twitter.util.Future;
 import org.junit.Test;
 import scala.runtime.BoxedUnit;
 
+import java.io.IOException;
+import java.net.ServerSocket;
+
 import static org.junit.Assert.assertEquals;
 
 public class FinagleIntegrationTest {
+
+    private static final int DEFAULT_PORT = 8079;
+
     @Test
     public void givenServerAndClient_whenRequestSent_thenClientShouldReceiveResponseFromServer() throws Exception {
         // given
+        int port = randomPort();
         Service serverService = new LogFilter().andThen(new GreetingService());
-        Http.serve(":8080", serverService);
+        Http.serve(":" + port, serverService);
 
-        Service<Request, Response> clientService = new LogFilter().andThen(Http.newService(":8080"));
+        Service<Request, Response> clientService = new LogFilter().andThen(Http.newService(":" + port));
 
         // when
         Request request = Request.apply(Method.Get(), "/?name=John");
@@ -37,4 +44,13 @@ public class FinagleIntegrationTest {
                 })
         );
     }
+
+    private int randomPort() {
+        try (ServerSocket socket = new ServerSocket(0)) {
+            return socket.getLocalPort();
+
+        } catch (IOException e) {
+            return DEFAULT_PORT;
+        }
+    }
 }