BAEL-1327 Java Threads: notify and wait (initial commit) (#3160)

core-java-concurrency/src/test/java/com/baeldung/concurrent/waitandnotify/NetworkIntegrationTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class NetworkIntegrationTest {
+
+	private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+	private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
+	private String expected;
+	
+	@Before
+	public void setUpStreams() {
+	    System.setOut(new PrintStream(outContent));
+	    System.setErr(new PrintStream(errContent));
+	}
+	
+	@Before
+	public void setUpExpectedOutput() {
+		StringWriter expectedStringWriter = new StringWriter();
+		
+		PrintWriter printWriter = new PrintWriter(expectedStringWriter);
+		printWriter.println("First packet");
+		printWriter.println("Second packet");
+		printWriter.println("Third packet");
+		printWriter.println("Fourth packet");
+		printWriter.close();
+		
+		expected = expectedStringWriter.toString();
+	}
+
+	@After
+	public void cleanUpStreams() {
+	    System.setOut(null);
+	    System.setErr(null);
+	}
+	
+	@Test
+	public void givenSenderAndReceiver_whenSendingPackets_thenNetworkSynchronized() {
+        Data data = new Data();
+        Thread sender = new Thread(new Sender(data));
+        Thread receiver = new Thread(new Receiver(data));
+        
+        sender.start();
+        receiver.start();
+        
+        //wait for sender and receiver to finish before we test against expected
+        try {
+			sender.join();
+			receiver.join();
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+		
+	    assertEquals(expected, outContent.toString());
+	}
+}