Merge branch 'master' of https://github.com/fluxw42/java-design-patterns into fluxw42-master

Conflicts:
	monostate/src/main/java/com/iluwatar/monostate/LoadBalancer.java

layers/pom.xml

@@ -32,5 +32,10 @@
 			<artifactId>junit</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-core</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 </project>

layers/src/main/java/com/iluwatar/layers/CakeBakingServiceImpl.java

@@ -30,9 +30,9 @@ public class CakeBakingServiceImpl implements CakeBakingService {
 
   @Override
   public void bakeNewCake(CakeInfo cakeInfo) throws CakeBakingException {
-    List<CakeToppingInfo> allToppings = getAvailableToppings();
-    List<CakeToppingInfo> matchingToppings =
-        allToppings.stream().filter((t) -> t.name.equals(cakeInfo.cakeToppingInfo.name))
+    List<CakeTopping> allToppings = getAvailableToppingEntities();
+    List<CakeTopping> matchingToppings =
+        allToppings.stream().filter((t) -> t.getName().equals(cakeInfo.cakeToppingInfo.name))
             .collect(Collectors.toList());
     if (matchingToppings.isEmpty()) {
       throw new CakeBakingException(String.format("Topping %s is not available",
@@ -50,7 +50,7 @@ public class CakeBakingServiceImpl implements CakeBakingService {
       }
     }
     CakeToppingDao toppingBean = context.getBean(CakeToppingDao.class);
-    CakeTopping topping = toppingBean.findOne(matchingToppings.iterator().next().id.get());
+    CakeTopping topping = toppingBean.findOne(matchingToppings.iterator().next().getId());
     CakeDao cakeBean = context.getBean(CakeDao.class);
     Cake cake = new Cake();
     cake.setTopping(topping);

layers/src/main/java/com/iluwatar/layers/CakeInfo.java

@@ -43,7 +43,7 @@ public class CakeInfo {
 
   @Override
   public String toString() {
-    return String.format("CakeInfo id=%d topping=%s layers=%s totalCalories=%d", id.get(),
+    return String.format("CakeInfo id=%d topping=%s layers=%s totalCalories=%d", id.orElse(-1L),
         cakeToppingInfo, cakeLayerInfos, calculateTotalCalories());
   }
 }

layers/src/main/java/com/iluwatar/layers/CakeLayerInfo.java

@@ -33,6 +33,6 @@ public class CakeLayerInfo {
 
   @Override
   public String toString() {
-    return String.format("CakeLayerInfo id=%d name=%s calories=%d", id.get(), name, calories);
+    return String.format("CakeLayerInfo id=%d name=%s calories=%d", id.orElse(-1L), name, calories);
   }
 }

layers/src/main/java/com/iluwatar/layers/CakeTopping.java

@@ -58,7 +58,7 @@ public class CakeTopping {
 
   @Override
   public String toString() {
-    return String.format("id=%s name=%s calories=%d", name, calories);
+    return String.format("id=%s name=%s calories=%d", id, name, calories);
   }
 
   public Cake getCake() {

layers/src/main/java/com/iluwatar/layers/CakeToppingInfo.java

@@ -33,6 +33,6 @@ public class CakeToppingInfo {
 
   @Override
   public String toString() {
-    return String.format("CakeToppingInfo id=%d name=%s calories=%d", id.get(), name, calories);
+    return String.format("CakeToppingInfo id=%d name=%s calories=%d", id.orElse(-1L), name, calories);
   }
 }

layers/src/test/java/com/iluwatar/layers/CakeBakingExceptionTest.java

@@ -0,0 +1,30 @@
+package com.iluwatar.layers;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Date: 12/15/15 - 7:57 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class CakeBakingExceptionTest {
+
+  @Test
+  public void testConstructor() throws Exception {
+    final CakeBakingException exception = new CakeBakingException();
+    assertNull(exception.getMessage());
+    assertNull(exception.getCause());
+  }
+
+  @Test
+  public void testConstructorWithMessage() throws Exception {
+    final String expectedMessage = "message";
+    final CakeBakingException exception = new CakeBakingException(expectedMessage);
+    assertEquals(expectedMessage, exception.getMessage());
+    assertNull(exception.getCause());
+  }
+
+}

layers/src/test/java/com/iluwatar/layers/CakeBakingServiceImplTest.java

@@ -0,0 +1,159 @@
+package com.iluwatar.layers;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Date: 12/15/15 - 9:55 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class CakeBakingServiceImplTest {
+
+  @Test
+  public void testLayers() throws CakeBakingException {
+    final CakeBakingServiceImpl service = new CakeBakingServiceImpl();
+
+    final List<CakeLayerInfo> initialLayers = service.getAvailableLayers();
+    assertNotNull(initialLayers);
+    assertTrue(initialLayers.isEmpty());
+
+    service.saveNewLayer(new CakeLayerInfo("Layer1", 1000));
+    service.saveNewLayer(new CakeLayerInfo("Layer2", 2000));
+
+    final List<CakeLayerInfo> availableLayers = service.getAvailableLayers();
+    assertNotNull(availableLayers);
+    assertEquals(2, availableLayers.size());
+    for (final CakeLayerInfo layer : availableLayers) {
+      assertNotNull(layer.id);
+      assertNotNull(layer.name);
+      assertNotNull(layer.toString());
+      assertTrue(layer.calories > 0);
+    }
+
+  }
+
+  @Test
+  public void testToppings() throws CakeBakingException {
+    final CakeBakingServiceImpl service = new CakeBakingServiceImpl();
+
+    final List<CakeToppingInfo> initialToppings = service.getAvailableToppings();
+    assertNotNull(initialToppings);
+    assertTrue(initialToppings.isEmpty());
+
+    service.saveNewTopping(new CakeToppingInfo("Topping1", 1000));
+    service.saveNewTopping(new CakeToppingInfo("Topping2", 2000));
+
+    final List<CakeToppingInfo> availableToppings = service.getAvailableToppings();
+    assertNotNull(availableToppings);
+    assertEquals(2, availableToppings.size());
+    for (final CakeToppingInfo topping : availableToppings) {
+      assertNotNull(topping.id);
+      assertNotNull(topping.name);
+      assertNotNull(topping.toString());
+      assertTrue(topping.calories > 0);
+    }
+
+  }
+
+  @Test
+  public void testBakeCakes() throws CakeBakingException {
+    final CakeBakingServiceImpl service = new CakeBakingServiceImpl();
+
+    final List<CakeInfo> initialCakes = service.getAllCakes();
+    assertNotNull(initialCakes);
+    assertTrue(initialCakes.isEmpty());
+
+    final CakeToppingInfo topping1 = new CakeToppingInfo("Topping1", 1000);
+    final CakeToppingInfo topping2 = new CakeToppingInfo("Topping2", 2000);
+    service.saveNewTopping(topping1);
+    service.saveNewTopping(topping2);
+
+    final CakeLayerInfo layer1 = new CakeLayerInfo("Layer1", 1000);
+    final CakeLayerInfo layer2 = new CakeLayerInfo("Layer2", 2000);
+    final CakeLayerInfo layer3 = new CakeLayerInfo("Layer3", 2000);
+    service.saveNewLayer(layer1);
+    service.saveNewLayer(layer2);
+    service.saveNewLayer(layer3);
+
+    service.bakeNewCake(new CakeInfo(topping1, Arrays.asList(layer1, layer2)));
+    service.bakeNewCake(new CakeInfo(topping2, Collections.singletonList(layer3)));
+
+    final List<CakeInfo> allCakes = service.getAllCakes();
+    assertNotNull(allCakes);
+    assertEquals(2, allCakes.size());
+    for (final CakeInfo cakeInfo : allCakes) {
+      assertNotNull(cakeInfo.id);
+      assertNotNull(cakeInfo.cakeToppingInfo);
+      assertNotNull(cakeInfo.cakeLayerInfos);
+      assertNotNull(cakeInfo.toString());
+      assertFalse(cakeInfo.cakeLayerInfos.isEmpty());
+      assertTrue(cakeInfo.calculateTotalCalories() > 0);
+    }
+
+  }
+
+  @Test(expected = CakeBakingException.class)
+  public void testBakeCakeMissingTopping() throws CakeBakingException {
+    final CakeBakingServiceImpl service = new CakeBakingServiceImpl();
+
+    final CakeLayerInfo layer1 = new CakeLayerInfo("Layer1", 1000);
+    final CakeLayerInfo layer2 = new CakeLayerInfo("Layer2", 2000);
+    service.saveNewLayer(layer1);
+    service.saveNewLayer(layer2);
+
+    final CakeToppingInfo missingTopping = new CakeToppingInfo("Topping1", 1000);
+    service.bakeNewCake(new CakeInfo(missingTopping, Arrays.asList(layer1, layer2)));
+  }
+
+  @Test(expected = CakeBakingException.class)
+  public void testBakeCakeMissingLayer() throws CakeBakingException {
+    final CakeBakingServiceImpl service = new CakeBakingServiceImpl();
+
+    final List<CakeInfo> initialCakes = service.getAllCakes();
+    assertNotNull(initialCakes);
+    assertTrue(initialCakes.isEmpty());
+
+    final CakeToppingInfo topping1 = new CakeToppingInfo("Topping1", 1000);
+    service.saveNewTopping(topping1);
+
+    final CakeLayerInfo layer1 = new CakeLayerInfo("Layer1", 1000);
+    service.saveNewLayer(layer1);
+
+    final CakeLayerInfo missingLayer = new CakeLayerInfo("Layer2", 2000);
+    service.bakeNewCake(new CakeInfo(topping1, Arrays.asList(layer1, missingLayer)));
+
+  }
+
+  @Test(expected = CakeBakingException.class)
+  public void testBakeCakesUsedLayer() throws CakeBakingException {
+    final CakeBakingServiceImpl service = new CakeBakingServiceImpl();
+
+    final List<CakeInfo> initialCakes = service.getAllCakes();
+    assertNotNull(initialCakes);
+    assertTrue(initialCakes.isEmpty());
+
+    final CakeToppingInfo topping1 = new CakeToppingInfo("Topping1", 1000);
+    final CakeToppingInfo topping2 = new CakeToppingInfo("Topping2", 2000);
+    service.saveNewTopping(topping1);
+    service.saveNewTopping(topping2);
+
+    final CakeLayerInfo layer1 = new CakeLayerInfo("Layer1", 1000);
+    final CakeLayerInfo layer2 = new CakeLayerInfo("Layer2", 2000);
+    service.saveNewLayer(layer1);
+    service.saveNewLayer(layer2);
+
+    service.bakeNewCake(new CakeInfo(topping1, Arrays.asList(layer1, layer2)));
+    service.bakeNewCake(new CakeInfo(topping2, Collections.singletonList(layer2)));
+
+  }
+
+}

layers/src/test/java/com/iluwatar/layers/CakeTest.java

@@ -0,0 +1,97 @@
+package com.iluwatar.layers;
+
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Date: 12/15/15 - 8:02 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class CakeTest {
+
+  @Test
+  public void testSetId() {
+    final Cake cake = new Cake();
+    assertNull(cake.getId());
+
+    final Long expectedId = Long.valueOf(1234L);
+    cake.setId(expectedId);
+    assertEquals(expectedId, cake.getId());
+  }
+
+  @Test
+  public void testSetTopping() {
+    final Cake cake = new Cake();
+    assertNull(cake.getTopping());
+
+    final CakeTopping expectedTopping = new CakeTopping("DummyTopping", 1000);
+    cake.setTopping(expectedTopping);
+    assertEquals(expectedTopping, cake.getTopping());
+  }
+
+  @Test
+  public void testSetLayers() {
+    final Cake cake = new Cake();
+    assertNotNull(cake.getLayers());
+    assertTrue(cake.getLayers().isEmpty());
+
+    final Set<CakeLayer> expectedLayers = new HashSet<>();
+    expectedLayers.add(new CakeLayer("layer1", 1000));
+    expectedLayers.add(new CakeLayer("layer2", 2000));
+    expectedLayers.add(new CakeLayer("layer3", 3000));
+
+    cake.setLayers(expectedLayers);
+    assertEquals(expectedLayers, cake.getLayers());
+  }
+
+  @Test
+  public void testAddLayer() {
+    final Cake cake = new Cake();
+    assertNotNull(cake.getLayers());
+    assertTrue(cake.getLayers().isEmpty());
+
+    final Set<CakeLayer> initialLayers = new HashSet<>();
+    initialLayers.add(new CakeLayer("layer1", 1000));
+    initialLayers.add(new CakeLayer("layer2", 2000));
+
+    cake.setLayers(initialLayers);
+    assertEquals(initialLayers, cake.getLayers());
+
+    final CakeLayer newLayer = new CakeLayer("layer3", 3000);
+    cake.addLayer(newLayer);
+
+    final Set<CakeLayer> expectedLayers = new HashSet<>();
+    expectedLayers.addAll(initialLayers);
+    expectedLayers.addAll(initialLayers);
+    expectedLayers.add(newLayer);
+    assertEquals(expectedLayers, cake.getLayers());
+  }
+
+  @Test
+  public void testToString() {
+    final CakeTopping topping = new CakeTopping("topping", 20);
+    topping.setId(2345L);
+
+    final CakeLayer layer = new CakeLayer("layer", 100);
+    layer.setId(3456L);
+
+    final Cake cake = new Cake();
+    cake.setId(1234L);
+    cake.setTopping(topping);
+    cake.addLayer(layer);
+
+    final String expected = "id=1234 topping=id=2345 name=topping calories=20 " +
+            "layers=[id=3456 name=layer calories=100]";
+    assertEquals(expected, cake.toString());
+
+  }
+
+}

layers/src/test/java/com/iluwatar/layers/CakeViewImplTest.java

@@ -0,0 +1,48 @@
+package com.iluwatar.layers;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
+import static org.mockito.Mockito.when;
+
+/**
+ * Date: 12/15/15 - 10:04 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class CakeViewImplTest extends StdOutTest {
+
+  /**
+   * Verify if the cake view renders the expected result
+   */
+  @Test
+  public void testRender() {
+
+    final List<CakeLayerInfo> layers = new ArrayList<>();
+    layers.add(new CakeLayerInfo("layer1", 1000));
+    layers.add(new CakeLayerInfo("layer2", 2000));
+    layers.add(new CakeLayerInfo("layer3", 3000));
+
+    final List<CakeInfo> cakes = new ArrayList<>();
+    final CakeInfo cake = new CakeInfo(new CakeToppingInfo("topping", 1000), layers);
+    cakes.add(cake);
+
+    final CakeBakingService bakingService = mock(CakeBakingService.class);
+    when(bakingService.getAllCakes()).thenReturn(cakes);
+
+    final CakeViewImpl cakeView = new CakeViewImpl(bakingService);
+
+    verifyZeroInteractions(getStdOutMock());
+
+    cakeView.render();
+    verify(getStdOutMock(), times(1)).println(cake);
+
+  }
+
+}

layers/src/test/java/com/iluwatar/layers/StdOutTest.java

@@ -0,0 +1,54 @@
+package com.iluwatar.layers;
+
+import org.junit.After;
+import org.junit.Before;
+
+import java.io.PrintStream;
+
+import static org.mockito.Mockito.mock;
+
+/**
+ * Date: 12/10/15 - 8:37 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public abstract class StdOutTest {
+
+  /**
+   * The mocked standard out {@link PrintStream}, required since the actions of the views don't have
+   * any influence on any other accessible objects, except for writing to std-out using {@link
+   * System#out}
+   */
+  private final PrintStream stdOutMock = mock(PrintStream.class);
+
+  /**
+   * Keep the original std-out so it can be restored after the test
+   */
+  private final PrintStream stdOutOrig = System.out;
+
+  /**
+   * Inject the mocked std-out {@link PrintStream} into the {@link System} class before each test
+   */
+  @Before
+  public void setUp() {
+    System.setOut(this.stdOutMock);
+  }
+
+  /**
+   * Removed the mocked std-out {@link PrintStream} again from the {@link System} class
+   */
+  @After
+  public void tearDown() {
+    System.setOut(this.stdOutOrig);
+  }
+
+  /**
+   * Get the mocked stdOut {@link PrintStream}
+   *
+   * @return The stdOut print stream mock, renewed before each test
+   */
+  final PrintStream getStdOutMock() {
+    return this.stdOutMock;
+  }
+
+}

lazy-loading/src/test/java/com/iluwatar/lazy/loading/AbstractHolderTest.java

@@ -0,0 +1,41 @@
+package com.iluwatar.lazy.loading;
+
+import org.junit.Test;
+
+import static junit.framework.Assert.assertNotNull;
+import static junit.framework.Assert.assertSame;
+import static junit.framework.TestCase.assertNull;
+
+/**
+ * Date: 12/19/15 - 11:58 AM
+ *
+ * @author Jeroen Meulemeester
+ */
+public abstract class AbstractHolderTest {
+
+  /**
+   * Get the internal state of the holder value
+   *
+   * @return The internal value
+   */
+  abstract Heavy getInternalHeavyValue() throws Exception;
+
+  /**
+   * Request a lazy loaded {@link Heavy} object from the holder.
+   *
+   * @return The lazy loaded {@link Heavy} object
+   */
+  abstract Heavy getHeavy() throws Exception;
+
+  /**
+   * This test shows that the heavy field is not instantiated until the method getHeavy is called
+   */
+  @Test(timeout = 3000)
+  public void testGetHeavy() throws Exception {
+    assertNull(getInternalHeavyValue());
+    assertNotNull(getHeavy());
+    assertNotNull(getInternalHeavyValue());
+    assertSame(getHeavy(), getInternalHeavyValue());
+  }
+
+}

lazy-loading/src/test/java/com/iluwatar/lazy/loading/HolderNaiveTest.java

@@ -0,0 +1,26 @@
+package com.iluwatar.lazy.loading;
+
+import java.lang.reflect.Field;
+
+/**
+ * Date: 12/19/15 - 12:05 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class HolderNaiveTest extends AbstractHolderTest {
+
+  private final HolderNaive holder = new HolderNaive();
+
+  @Override
+  Heavy getInternalHeavyValue() throws Exception {
+    final Field holderField = HolderNaive.class.getDeclaredField("heavy");
+    holderField.setAccessible(true);
+    return (Heavy) holderField.get(this.holder);
+  }
+
+  @Override
+  Heavy getHeavy() {
+    return holder.getHeavy();
+  }
+
+}

lazy-loading/src/test/java/com/iluwatar/lazy/loading/HolderThreadSafeTest.java

@@ -1,45 +1,26 @@
 package com.iluwatar.lazy.loading;
 
-import org.junit.Test;
-
 import java.lang.reflect.Field;
 
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-
 /**
- * Using reflection this test shows that the heavy field is not instantiated until the method
- * getHeavy is called
+ * Date: 12/19/15 - 12:19 PM
  *
- * Created by jones on 11/10/2015.
+ * @author Jeroen Meulemeester
  */
-public class HolderThreadSafeTest {
+public class HolderThreadSafeTest extends AbstractHolderTest {
 
-  @Test
-  public void test() throws IllegalAccessException {
-    HolderThreadSafe hts = new HolderThreadSafe();
+  private final HolderThreadSafe holder = new HolderThreadSafe();
 
-    {
-      // first call is null
-      Field[] ff = HolderThreadSafe.class.getDeclaredFields();
-      for (Field f : ff) {
-        f.setAccessible(true);
-      }
-
-      assertNull(ff[0].get(hts));
-    }
-
-    // now it is lazily loaded
-    hts.getHeavy();
-
-    {
-      // now it is not null - call via reflection so that the test is the same before and after
-      Field[] ff = HolderThreadSafe.class.getDeclaredFields();
-      for (Field f : ff) {
-        f.setAccessible(true);
-      }
-
-      assertNotNull(ff[0].get(hts));
-    }
+  @Override
+  Heavy getInternalHeavyValue() throws Exception {
+    final Field holderField = HolderThreadSafe.class.getDeclaredField("heavy");
+    holderField.setAccessible(true);
+    return (Heavy) holderField.get(this.holder);
   }
-}
+
+  @Override
+  Heavy getHeavy() throws Exception {
+    return this.holder.getHeavy();
+  }
+
+}

lazy-loading/src/test/java/com/iluwatar/lazy/loading/Java8HolderTest.java

@@ -0,0 +1,40 @@
+package com.iluwatar.lazy.loading;
+
+import java.lang.reflect.Field;
+import java.util.function.Supplier;
+
+/**
+ * Date: 12/19/15 - 12:27 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class Java8HolderTest extends AbstractHolderTest {
+
+  private final Java8Holder holder = new Java8Holder();
+
+
+  @Override
+  Heavy getInternalHeavyValue() throws Exception {
+    final Field holderField = Java8Holder.class.getDeclaredField("heavy");
+    holderField.setAccessible(true);
+
+    final Supplier<Heavy> supplier = (Supplier<Heavy>) holderField.get(this.holder);
+    final Class<? extends Supplier> supplierClass = supplier.getClass();
+
+    // This is a little fishy, but I don't know another way to test this:
+    // The lazy holder is at first a lambda, but gets replaced with a new supplier after loading ...
+    if (supplierClass.isLocalClass()) {
+      final Field instanceField = supplierClass.getDeclaredField("heavyInstance");
+      instanceField.setAccessible(true);
+      return (Heavy) instanceField.get(supplier);
+    } else {
+      return null;
+    }
+  }
+
+  @Override
+  Heavy getHeavy() throws Exception {
+    return holder.getHeavy();
+  }
+
+}

mediator/pom.xml

@@ -14,5 +14,10 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>

mediator/src/test/java/com/iluwatar/mediator/PartyImplTest.java

@@ -0,0 +1,41 @@
+package com.iluwatar.mediator;
+
+import org.junit.Test;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+/**
+ * Date: 12/19/15 - 10:00 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class PartyImplTest {
+
+  /**
+   * Verify if a member is notified when it's joining a party. Generate an action and see if the
+   * other member gets it. Also check members don't get their own actions.
+   */
+  @Test
+  public void testPartyAction() {
+    final PartyMember partyMember1 = mock(PartyMember.class);
+    final PartyMember partyMember2 = mock(PartyMember.class);
+
+    final PartyImpl party = new PartyImpl();
+    party.addMember(partyMember1);
+    party.addMember(partyMember2);
+
+    verify(partyMember1).joinedParty(party);
+    verify(partyMember2).joinedParty(party);
+
+    party.act(partyMember1, Action.GOLD);
+    verifyZeroInteractions(partyMember1);
+    verify(partyMember2).partyAction(Action.GOLD);
+
+    verifyNoMoreInteractions(partyMember1, partyMember2);
+
+  }
+
+}

mediator/src/test/java/com/iluwatar/mediator/PartyMemberTest.java

@@ -0,0 +1,128 @@
+package com.iluwatar.mediator;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.io.PrintStream;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.function.Supplier;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+/**
+ * Date: 12/19/15 - 10:13 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+@RunWith(Parameterized.class)
+public class PartyMemberTest {
+
+  @Parameterized.Parameters
+  public static Collection<Supplier<PartyMember>[]> data() {
+    return Arrays.asList(
+            new Supplier[]{Hobbit::new},
+            new Supplier[]{Hunter::new},
+            new Supplier[]{Rogue::new},
+            new Supplier[]{Wizard::new}
+    );
+  }
+
+  /**
+   * The mocked standard out {@link PrintStream}, required since some actions on a {@link
+   * PartyMember} have any influence on any other accessible objects, except for writing to std-out
+   * using {@link System#out}
+   */
+  private final PrintStream stdOutMock = mock(PrintStream.class);
+
+  /**
+   * Keep the original std-out so it can be restored after the test
+   */
+  private final PrintStream stdOutOrig = System.out;
+
+  /**
+   * Inject the mocked std-out {@link PrintStream} into the {@link System} class before each test
+   */
+  @Before
+  public void setUp() {
+    System.setOut(this.stdOutMock);
+  }
+
+  /**
+   * Removed the mocked std-out {@link PrintStream} again from the {@link System} class
+   */
+  @After
+  public void tearDown() {
+    System.setOut(this.stdOutOrig);
+  }
+
+  /**
+   * The factory, used to create a new instance of the tested party member
+   */
+  private final Supplier<PartyMember> memberSupplier;
+
+  /**
+   * Create a new test instance, using the given {@link PartyMember} factory
+   *
+   * @param memberSupplier The party member factory
+   */
+  public PartyMemberTest(final Supplier<PartyMember> memberSupplier) {
+    this.memberSupplier = memberSupplier;
+  }
+
+  /**
+   * Verify if a party action triggers the correct output to the std-Out
+   */
+  @Test
+  public void testPartyAction() {
+    final PartyMember member = this.memberSupplier.get();
+
+    for (final Action action : Action.values()) {
+      member.partyAction(action);
+      verify(this.stdOutMock).println(member.toString() + " " + action.getDescription());
+    }
+
+    verifyNoMoreInteractions(this.stdOutMock);
+  }
+
+  /**
+   * Verify if a member action triggers the expected interactions with the party class
+   */
+  @Test
+  public void testAct() {
+    final PartyMember member = this.memberSupplier.get();
+
+    member.act(Action.GOLD);
+    verifyZeroInteractions(this.stdOutMock);
+
+    final Party party = mock(Party.class);
+    member.joinedParty(party);
+    verify(this.stdOutMock).println(member.toString() + " joins the party");
+
+    for (final Action action : Action.values()) {
+      member.act(action);
+      verify(this.stdOutMock).println(member.toString() + " " + action.toString());
+      verify(party).act(member, action);
+    }
+
+    verifyNoMoreInteractions(party, this.stdOutMock);
+  }
+
+  /**
+   * Verify if {@link PartyMember#toString()} generate the expected output
+   */
+  @Test
+  public void testToString() throws Exception {
+    final PartyMember member = this.memberSupplier.get();
+    final Class<? extends PartyMember> memberClass = member.getClass();
+    assertEquals(memberClass.getSimpleName(), member.toString());
+  }
+
+}

memento/src/test/java/com/iluwatar/memento/StarTest.java

@@ -0,0 +1,75 @@
+package com.iluwatar.memento;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Date: 12/20/15 - 10:08 AM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class StarTest {
+
+  /**
+   * Verify the stages of a dying sun, without going back in time
+   */
+  @Test
+  public void testTimePasses() {
+    final Star star = new Star(StarType.SUN, 1, 2);
+    assertEquals("sun age: 1 years mass: 2 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("red giant age: 2 years mass: 16 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("white dwarf age: 4 years mass: 128 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("supernova age: 8 years mass: 1024 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("dead star age: 16 years mass: 8192 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("dead star age: 64 years mass: 0 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("dead star age: 256 years mass: 0 tons", star.toString());
+  }
+
+  /**
+   * Verify some stage of a dying sun, but go back in time to test the memento
+   */
+  @Test
+  public void testSetMemento() {
+    final Star star = new Star(StarType.SUN, 1, 2);
+    final StarMemento firstMemento = star.getMemento();
+    assertEquals("sun age: 1 years mass: 2 tons", star.toString());
+
+    star.timePasses();
+    final StarMemento secondMemento = star.getMemento();
+    assertEquals("red giant age: 2 years mass: 16 tons", star.toString());
+
+    star.timePasses();
+    final StarMemento thirdMemento = star.getMemento();
+    assertEquals("white dwarf age: 4 years mass: 128 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("supernova age: 8 years mass: 1024 tons", star.toString());
+
+    star.setMemento(thirdMemento);
+    assertEquals("white dwarf age: 4 years mass: 128 tons", star.toString());
+
+    star.timePasses();
+    assertEquals("supernova age: 8 years mass: 1024 tons", star.toString());
+
+    star.setMemento(secondMemento);
+    assertEquals("red giant age: 2 years mass: 16 tons", star.toString());
+
+    star.setMemento(firstMemento);
+    assertEquals("sun age: 1 years mass: 2 tons", star.toString());
+
+  }
+
+}

model-view-controller/pom.xml

@@ -14,5 +14,10 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>

model-view-controller/src/test/java/com/iluwatar/model/view/controller/GiantControllerTest.java

@@ -0,0 +1,100 @@
+package com.iluwatar.model.view.controller;
+
+import org.junit.Test;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+/**
+ * Date: 12/20/15 - 2:19 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class GiantControllerTest {
+
+  /**
+   * Verify if the controller passes the health level through to the model and vice versa
+   */
+  @Test
+  public void testSetHealth() {
+    final GiantModel model = mock(GiantModel.class);
+    final GiantView view = mock(GiantView.class);
+    final GiantController controller = new GiantController(model, view);
+
+    verifyZeroInteractions(model, view);
+
+    for (final Health health : Health.values()) {
+      controller.setHealth(health);
+      verify(model).setHealth(health);
+      verifyZeroInteractions(view);
+    }
+
+    controller.getHealth();
+    verify(model).getHealth();
+
+    verifyNoMoreInteractions(model, view);
+  }
+
+  /**
+   * Verify if the controller passes the fatigue level through to the model and vice versa
+   */
+  @Test
+  public void testSetFatigue() {
+    final GiantModel model = mock(GiantModel.class);
+    final GiantView view = mock(GiantView.class);
+    final GiantController controller = new GiantController(model, view);
+
+    verifyZeroInteractions(model, view);
+
+    for (final Fatigue fatigue : Fatigue.values()) {
+      controller.setFatigue(fatigue);
+      verify(model).setFatigue(fatigue);
+      verifyZeroInteractions(view);
+    }
+
+    controller.getFatigue();
+    verify(model).getFatigue();
+
+    verifyNoMoreInteractions(model, view);
+  }
+
+  /**
+   * Verify if the controller passes the nourishment level through to the model and vice versa
+   */
+  @Test
+  public void testSetNourishment() {
+    final GiantModel model = mock(GiantModel.class);
+    final GiantView view = mock(GiantView.class);
+    final GiantController controller = new GiantController(model, view);
+
+    verifyZeroInteractions(model, view);
+
+    for (final Nourishment nourishment : Nourishment.values()) {
+      controller.setNourishment(nourishment);
+      verify(model).setNourishment(nourishment);
+      verifyZeroInteractions(view);
+    }
+
+    controller.getNourishment();
+    verify(model).getNourishment();
+
+    verifyNoMoreInteractions(model, view);
+  }
+
+  @Test
+  public void testUpdateView() {
+    final GiantModel model = mock(GiantModel.class);
+    final GiantView view = mock(GiantView.class);
+    final GiantController controller = new GiantController(model, view);
+
+    verifyZeroInteractions(model, view);
+
+    controller.updateView();
+    verify(view).displayGiant(model);
+
+    verifyNoMoreInteractions(model, view);
+  }
+
+}

model-view-controller/src/test/java/com/iluwatar/model/view/controller/GiantModelTest.java

@@ -0,0 +1,56 @@
+package com.iluwatar.model.view.controller;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Date: 12/20/15 - 2:10 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class GiantModelTest {
+
+  /**
+   * Verify if the health value is set properly though the constructor and setter
+   */
+  @Test
+  public void testSetHealth() {
+    final GiantModel model = new GiantModel(Health.HEALTHY, Fatigue.ALERT, Nourishment.SATURATED);
+    assertEquals(Health.HEALTHY, model.getHealth());
+    for (final Health health : Health.values()) {
+      model.setHealth(health);
+      assertEquals(health, model.getHealth());
+      assertEquals("The giant looks " + health.toString() + ", alert and saturated.", model.toString());
+    }
+  }
+
+  /**
+   * Verify if the fatigue level is set properly though the constructor and setter
+   */
+  @Test
+  public void testSetFatigue() {
+    final GiantModel model = new GiantModel(Health.HEALTHY, Fatigue.ALERT, Nourishment.SATURATED);
+    assertEquals(Fatigue.ALERT, model.getFatigue());
+    for (final Fatigue fatigue : Fatigue.values()) {
+      model.setFatigue(fatigue);
+      assertEquals(fatigue, model.getFatigue());
+      assertEquals("The giant looks healthy, " + fatigue.toString() + " and saturated.", model.toString());
+    }
+  }
+
+  /**
+   * Verify if the nourishment level is set properly though the constructor and setter
+   */
+  @Test
+  public void testSetNourishment() {
+    final GiantModel model = new GiantModel(Health.HEALTHY, Fatigue.ALERT, Nourishment.SATURATED);
+    assertEquals(Nourishment.SATURATED, model.getNourishment());
+    for (final Nourishment nourishment : Nourishment.values()) {
+      model.setNourishment(nourishment);
+      assertEquals(nourishment, model.getNourishment());
+      assertEquals("The giant looks healthy, alert and " + nourishment.toString() + ".", model.toString());
+    }
+  }
+
+}

model-view-controller/src/test/java/com/iluwatar/model/view/controller/GiantViewTest.java

@@ -0,0 +1,64 @@
+package com.iluwatar.model.view.controller;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.PrintStream;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+/**
+ * Date: 12/20/15 - 2:04 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class GiantViewTest {
+
+  /**
+   * The mocked standard out {@link PrintStream}, required since the actions of the views don't have
+   * any influence on any other accessible objects, except for writing to std-out using {@link
+   * System#out}
+   */
+  private final PrintStream stdOutMock = mock(PrintStream.class);
+
+  /**
+   * Keep the original std-out so it can be restored after the test
+   */
+  private final PrintStream stdOutOrig = System.out;
+
+  /**
+   * Inject the mocked std-out {@link PrintStream} into the {@link System} class before each test
+   */
+  @Before
+  public void setUp() {
+    System.setOut(this.stdOutMock);
+  }
+
+  /**
+   * Removed the mocked std-out {@link PrintStream} again from the {@link System} class
+   */
+  @After
+  public void tearDown() {
+    System.setOut(this.stdOutOrig);
+  }
+
+  /**
+   * Verify if the {@link GiantView} does what it has to do: Print the {@link GiantModel} to the
+   * standard out stream, nothing more, nothing less.
+   */
+  @Test
+  public void testDisplayGiant() {
+    final GiantView view = new GiantView();
+
+    final GiantModel model = mock(GiantModel.class);
+    view.displayGiant(model);
+
+    verify(this.stdOutMock).println(model);
+    verifyNoMoreInteractions(model, this.stdOutMock);
+
+  }
+
+}

model-view-presenter/src/test/java/com/iluwatar/model/view/presenter/AppTest.java

@@ -0,0 +1,18 @@
+package com.iluwatar.model.view.presenter;
+
+import org.junit.Test;
+
+/**
+ * 
+ * Application test
+ *
+ */
+public class AppTest {
+
+  @Test
+  public void test() {
+    String[] args = {};
+    App.main(args);
+  }
+
+}

model-view-presenter/src/test/java/com/iluwatar/model/view/presenter/FileLoaderTest.java

@@ -0,0 +1,24 @@
+package com.iluwatar.model.view.presenter;
+
+import org.junit.Test;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import static org.junit.Assert.*;
+
+/**
+ * Date: 12/21/15 - 12:12 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class FileLoaderTest {
+
+  @Test
+  public void testLoadData() throws Exception {
+    final FileLoader fileLoader = new FileLoader();
+    fileLoader.setFileName("non-existing-file");
+    assertNull(fileLoader.loadData());
+  }
+
+}

monostate/pom.xml

@@ -14,5 +14,10 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>

monostate/src/main/java/com/iluwatar/monostate/App.java

@@ -28,8 +28,8 @@ public class App {
   public static void main(String[] args) {
     LoadBalancer loadBalancer1 = new LoadBalancer();
     LoadBalancer loadBalancer2 = new LoadBalancer();
-    loadBalancer1.serverequest(new Request("Hello"));
-    loadBalancer2.serverequest(new Request("Hello World"));
+    loadBalancer1.serverRequest(new Request("Hello"));
+    loadBalancer2.serverRequest(new Request("Hello World"));
   }
 
 }

monostate/src/main/java/com/iluwatar/monostate/LoadBalancer.java

@@ -45,7 +45,7 @@ public class LoadBalancer {
   /**
    * Handle request
    */
-  public void serverequest(Request request) {
+  public void serverRequest(Request request) {
     if (lastServedId >= servers.size()) {
       lastServedId = 0;
     }

monostate/src/main/java/com/iluwatar/monostate/Server.java

@@ -28,7 +28,7 @@ public class Server {
     return port;
   }
 
-  public final void serve(Request request) {
+  public void serve(Request request) {
     System.out.println("Server ID " + id + " associated to host : " + getHost() + " and Port "
         + getPort() + " Processed request with value  " + request.value);
   }

monostate/src/test/java/com/iluwatar/monostate/AppTest.java

@@ -5,22 +5,10 @@ import org.junit.Test;
 
 public class AppTest {
 
-  @Test
-  public void testSameStateAmonstAllInstances() {
-    LoadBalancer balancer = new LoadBalancer();
-    LoadBalancer balancer2 = new LoadBalancer();
-    balancer.addServer(new Server("localhost", 8085, 6));
-    // Both should have the same number of servers.
-    Assert.assertTrue(balancer.getNoOfServers() == balancer2.getNoOfServers());
-    // Both Should have the same LastServedId
-    Assert.assertTrue(balancer.getLastServedId() == balancer2.getLastServedId());
-  }
-
   @Test
   public void testMain() {
     String[] args = {};
     App.main(args);
-    Assert.assertTrue(LoadBalancer.getLastServedId() == 2);
   }
 
 }

monostate/src/test/java/com/iluwatar/monostate/LoadBalancerTest.java

@@ -0,0 +1,55 @@
+package com.iluwatar.monostate;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.verifyZeroInteractions;
+import static org.mockito.Mockito.when;
+
+/**
+ * Date: 12/21/15 - 12:26 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class LoadBalancerTest {
+
+  @Test
+  public void testSameStateAmongstAllInstances() {
+    final LoadBalancer firstBalancer = new LoadBalancer();
+    final LoadBalancer secondBalancer = new LoadBalancer();
+    firstBalancer.addServer(new Server("localhost", 8085, 6));
+    // Both should have the same number of servers.
+    Assert.assertTrue(firstBalancer.getNoOfServers() == secondBalancer.getNoOfServers());
+    // Both Should have the same LastServedId
+    Assert.assertTrue(firstBalancer.getLastServedId() == secondBalancer.getLastServedId());
+  }
+
+  @Test
+  public void testServe() {
+    final Server server = mock(Server.class);
+    when(server.getHost()).thenReturn("testhost");
+    when(server.getPort()).thenReturn(1234);
+    doNothing().when(server).serve(any(Request.class));
+
+    final LoadBalancer loadBalancer = new LoadBalancer();
+    loadBalancer.addServer(server);
+
+    verifyZeroInteractions(server);
+
+    final Request request = new Request("test");
+    for (int i = 0; i < loadBalancer.getNoOfServers() * 2; i++) {
+      loadBalancer.serverRequest(request);
+    }
+
+    verify(server, times(2)).serve(request);
+    verifyNoMoreInteractions(server);
+
+  }
+
+}