Added tests for service-layer pattern

service-layer/src/test/java/com/iluwatar/servicelayer/app/AppTest.java

@@ -1,5 +1,8 @@
 package com.iluwatar.servicelayer.app;
 
+import com.iluwatar.servicelayer.hibernate.HibernateUtil;
+
+import org.junit.After;
 import org.junit.Test;
 
 /**
@@ -14,4 +17,10 @@ public class AppTest {
     String[] args = {};
     App.main(args);
   }
+
+  @After
+  public void tearDown() throws Exception {
+    HibernateUtil.dropSession();
+  }
+
 }