Fixed Failing EchoTest

core-java/src/test/java/com/baeldung/java/nio/selector/EchoTest.java

@@ -2,17 +2,20 @@ package com.baeldung.java.nio.selector;
 
 import static org.junit.Assert.assertEquals;
 
+import java.io.IOException;
+
 import org.junit.Test;
 
 public class EchoTest {
 
     @Test
-    public void givenClient_whenServerEchosMessage_thenCorrect() {
+    public void givenClient_whenServerEchosMessage_thenCorrect() throws IOException, InterruptedException {
+        Process process = EchoServer.start();
         EchoClient client = EchoClient.start();
         String resp1 = client.sendMessage("hello");
         String resp2 = client.sendMessage("world");
         assertEquals("hello", resp1);
         assertEquals("world", resp2);
+        process.destroy();
     }
-
 }