standardized exception based tests (#790)

* made changes to java reflection

* removed redundant method makeSound in Animal abstract class

* added project for play-framework article

* added project for regex

* changed regex project from own model to core-java

* added project for routing in play

* made changes to regex project

* refactored code for REST API with Play project

* refactored student store indexing to zero base

* added unit tests, removed bad names

* added NIO Selector project under core-java module

* requested changes made

* added project for nio2

* standardized exception based tests

core-java/src/main/java/com/baeldung/java/networking/udp/UDPTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.java.networking.udp;
+
+import static org.junit.Assert.*;
+
+import java.io.IOException;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class UDPTest {
+    EchoClient client = null;
+
+    @Before
+    public void setup() throws IOException {
+        new EchoServer().start();
+        client = new EchoClient();
+    }
+
+    @Test
+    public void whenCanSendAndReceivePacket_thenCorrect1() {
+        String echo = client.sendEcho("hello server");
+        assertEquals("hello server", echo);
+        echo = client.sendEcho("server is working");
+        assertFalse(echo.equals("hello server"));
+    }
+
+    @After
+    public void tearDown() {
+        client.sendEcho("end");
+        client.close();
+    }
+}