update emf implement

Change-Id: Id967eb0034a7fad33755b7e805b3d73ff49cd79f
diff --git a/src/test/java/databasetest/databasesystest.java b/src/test/java/databasetest/databasesystest.java
index f802360..f4b22f1 100644
--- a/src/test/java/databasetest/databasesystest.java
+++ b/src/test/java/databasetest/databasesystest.java
@@ -45,10 +45,7 @@
         props.put("javax.persistence.jdbc.driver", "com.mysql.cj.jdbc.Driver");
         emf = Persistence.createEntityManagerFactory("myPersistenceUnit", props);
         em = emf.createEntityManager();
-        db = new Database1();
-        java.lang.reflect.Field f = Database1.class.getDeclaredField("entitymanager");
-        f.setAccessible(true);
-        f.set(db, em);
+        db = new Database1(emf);
         testUserIds = new ArrayList<>();
         testEmails = new ArrayList<>();
         for (int i = 0; i < 10; i++) {