added project code for sockets

sockets/src/test/java/com/baeldung/socket/EchoMultiTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.socket;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class EchoMultiTest {
+	@Test
+	public void givenClient1_whenServerResponds_thenCorrect() {
+		EchoClient client1 = new EchoClient();
+		client1.startConnection("127.0.0.1", 5555);
+		String msg1 = client1.sendMessage("hello");
+		String msg2 = client1.sendMessage("world");
+		String terminate = client1.sendMessage(".");
+		assertEquals(msg1, "hello");
+		assertEquals(msg2, "world");
+		assertEquals(terminate, "bye");
+	}
+
+	@Test
+	public void givenClient2_whenServerResponds_thenCorrect() {
+		EchoClient client1 = new EchoClient();
+		client1.startConnection("127.0.0.1", 5555);
+		String msg1 = client1.sendMessage("hello");
+		String msg2 = client1.sendMessage("world");
+		String terminate = client1.sendMessage(".");
+		assertEquals(msg1, "hello");
+		assertEquals(msg2, "world");
+		assertEquals(terminate, "bye");
+	}
+
+	@Test
+	public void givenClient3_whenServerResponds_thenCorrect() {
+		EchoClient client1 = new EchoClient();
+		client1.startConnection("127.0.0.1", 5555);
+		String msg1 = client1.sendMessage("hello");
+		String msg2 = client1.sendMessage("world");
+		String terminate = client1.sendMessage(".");
+		assertEquals(msg1, "hello");
+		assertEquals(msg2, "world");
+		assertEquals(terminate, "bye");
+	}
+
+}