Added tests for producer-consumer pattern

producer-consumer/src/test/java/com/iluwatar/producer/consumer/ConsumerTest.java

@@ -0,0 +1,39 @@
+package com.iluwatar.producer.consumer;
+
+import org.junit.Test;
+import org.mockito.InOrder;
+
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.reset;
+import static org.mockito.Mockito.spy;
+
+/**
+ * Date: 12/27/15 - 11:01 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class ConsumerTest extends StdOutTest {
+
+  private static final int ITEM_COUNT = 5;
+
+  @Test
+  public void testConsume() throws Exception {
+    final ItemQueue queue = spy(new ItemQueue());
+    for (int id = 0; id < ITEM_COUNT; id++) {
+      queue.put(new Item("producer", id));
+    }
+
+    reset(queue); // Don't count the preparation above as interactions with the queue
+    final Consumer consumer = new Consumer("consumer", queue);
+
+    final InOrder inOrder = inOrder(getStdOutMock());
+    for (int id = 0; id < ITEM_COUNT; id++) {
+      consumer.consume();
+      inOrder.verify(getStdOutMock())
+              .println("Consumer [consumer] consume item [" + id + "] produced by [producer]");
+    }
+
+    inOrder.verifyNoMoreInteractions();
+  }
+
+}