#354 Added WelcomeMessage Service and Tests for tier example of featureToggle

feature-toggle/src/main/java/com/iluwatar/featuretoggle/pattern/Service.java

@@ -0,0 +1,11 @@
+package com.iluwatar.featuretoggle.pattern;
+
+import com.iluwatar.featuretoggle.user.User;
+
+/**
+ * Created by joseph on 26/01/16.
+ */
+public interface Service {
+
+    public String getWelcomeMessage(User user);
+}

feature-toggle/src/main/java/com/iluwatar/featuretoggle/pattern/tieredversion/TieredFeatureToggleVersion.java

@@ -0,0 +1,21 @@
+package com.iluwatar.featuretoggle.pattern.tieredversion;
+
+import com.iluwatar.featuretoggle.pattern.Service;
+import com.iluwatar.featuretoggle.user.User;
+import com.iluwatar.featuretoggle.user.UserGroup;
+
+/**
+ * Created by joseph on 26/01/16.
+ */
+public class TieredFeatureToggleVersion implements Service {
+
+    @Override
+    public String getWelcomeMessage(User user) {
+        if(UserGroup.isPaid(user)){
+            return "You're amazing thanks for paying for this awesome software.";
+        }
+
+        return "I suppose you can use this software.";
+    }
+
+}

feature-toggle/src/main/test/com/iluwatar/featuretoggle/pattern/tieredversion/TieredFeatureToggleVersionTest.java

@@ -0,0 +1,39 @@
+package com.iluwatar.featuretoggle.pattern.tieredversion;
+
+import com.iluwatar.featuretoggle.pattern.Service;
+import com.iluwatar.featuretoggle.user.User;
+import com.iluwatar.featuretoggle.user.UserGroup;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Created by joseph on 26/01/16.
+ */
+public class TieredFeatureToggleVersionTest {
+
+    User paidUser = new User();
+    User freeUser = new User();
+
+    @Before
+    public void setUp() throws Exception {
+        UserGroup.addUserToPaidGroup(paidUser);
+        UserGroup.addUserToFreeGroup(freeUser);
+
+    }
+
+    @Test
+    public void testGetWelcomeMessageForPaidUser() throws Exception {
+        Service service = new TieredFeatureToggleVersion();
+        String welcomeMessage = service.getWelcomeMessage(paidUser);
+        assertEquals("You're amazing thanks for paying for this awesome software.",welcomeMessage);
+    }
+
+    @Test
+    public void testGetWelcomeMessageForFreeUser() throws Exception {
+        Service service = new TieredFeatureToggleVersion();
+        String welcomeMessage = service.getWelcomeMessage(freeUser);
+        assertEquals("I suppose you can use this software.",welcomeMessage);
+    }
+}