Added proper tests for front-controller pattern

front-controller/src/test/java/com/iluwatar/front/controller/FrontControllerTest.java

@@ -0,0 +1,61 @@
+package com.iluwatar.front.controller;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+/**
+ * Date: 12/13/15 - 1:39 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+@RunWith(Parameterized.class)
+public class FrontControllerTest extends StdOutTest {
+
+  @Parameters
+  public static List<Object[]> data() {
+    final List<Object[]> parameters = new ArrayList<>();
+    parameters.add(new Object[]{new ArcherCommand(), "Displaying archers"});
+    parameters.add(new Object[]{new CatapultCommand(), "Displaying catapults"});
+    parameters.add(new Object[]{new UnknownCommand(), "Error 500"});
+    return parameters;
+  }
+
+  /**
+   * The view that's been tested
+   */
+  private final Command command;
+
+  /**
+   * The expected display message
+   */
+  private final String displayMessage;
+
+  /**
+   * Create a new instance of the {@link FrontControllerTest} with the given view and expected message
+   *
+   * @param command        The command that's been tested
+   * @param displayMessage The expected display message
+   */
+  public FrontControllerTest(final Command command, final String displayMessage) {
+    this.displayMessage = displayMessage;
+    this.command = command;
+  }
+
+  @Test
+  public void testDisplay() {
+    verifyZeroInteractions(getStdOutMock());
+    this.command.process();
+    verify(getStdOutMock()).println(displayMessage);
+    verifyNoMoreInteractions(getStdOutMock());
+  }
+
+}