Fix AsyncEchoClient

core-java/src/test/java/com/baeldung/java/nio2/async/AsyncEchoTest.java

@@ -1,13 +1,13 @@
 package com.baeldung.java.nio2.async;
 
-import static org.junit.Assert.*;
-
-import java.io.IOException;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+
 public class AsyncEchoTest {
 
     Process server;
@@ -20,7 +20,7 @@ public class AsyncEchoTest {
     }
 
     @Test
-    public void givenServerClient_whenServerEchosMessage_thenCorrect() {
+    public void givenServerClient_whenServerEchosMessage_thenCorrect() throws Exception {
         String resp1 = client.sendMessage("hello");
         String resp2 = client.sendMessage("world");
         assertEquals("hello", resp1);