Added tests for private-class-data pattern

private-class-data/src/test/java/com/iluwatar/privateclassdata/ImmutableStewTest.java

@@ -0,0 +1,52 @@
+package com.iluwatar.privateclassdata;
+
+import org.junit.Test;
+import org.mockito.InOrder;
+
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Date: 12/27/15 - 10:46 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class ImmutableStewTest extends StdOutTest {
+
+  /**
+   * Verify if mixing the stew doesn't change the internal state
+   */
+  @Test
+  public void testMix() {
+    final Stew stew = new Stew(1, 2, 3, 4);
+    final String message = "Mixing the stew we find: 1 potatoes, 2 carrots, 3 meat and 4 peppers";
+
+    final InOrder inOrder = inOrder(getStdOutMock());
+    for (int i = 0; i < 20; i++) {
+      stew.mix();
+      inOrder.verify(getStdOutMock()).println(message);
+    }
+
+    inOrder.verifyNoMoreInteractions();
+  }
+
+  /**
+   * Verify if tasting the stew actually removes one of each ingredient
+   */
+  @Test
+  public void testDrink() {
+    final Stew stew = new Stew(1, 2, 3, 4);
+    stew.mix();
+
+    verify(getStdOutMock())
+            .println("Mixing the stew we find: 1 potatoes, 2 carrots, 3 meat and 4 peppers");
+
+    stew.taste();
+    verify(getStdOutMock()).println("Tasting the stew");
+
+    stew.mix();
+    verify(getStdOutMock())
+            .println("Mixing the stew we find: 0 potatoes, 1 carrots, 2 meat and 3 peppers");
+
+  }
+}