Refactors Department management

Creates a Departments class with basic
Department management with the EntityManager.

src/main/java/dgpena/siexample/persistence/Departments.java

+package dgpena.siexample.persistence;
+
+import javax.persistence.EntityManager;
+
+public class Departments {
+
+	private EntityManager em;
+
+	public Departments(EntityManager em) {
+		this.em = em;
+	}
+	
+	public void addNewDepartment(Department d) {
+		em.getTransaction().begin();
+			em.persist(d);
+		em.getTransaction().commit();
+	}
+	
+	public Department findById(int id) {
+		return em.find(Department.class, id);
+	}
+}

src/test/java/dgpena/siexample/persistence/DepartmentTest.java → src/test/java/dgpena/siexample/persistence/DepartmentsTest.java

@@ -13,7 +13,7 @@ import javax.persistence.Persistence;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
-public class DepartmentTest extends SQLBasedTest {
+public class DepartmentsTest extends SQLBasedTest {
 
 	private static EntityManagerFactory emf;
 	
@@ -23,38 +23,33 @@ public class DepartmentTest extends SQLBasedTest {
 	}
 	
 	@Test
-	public void testCreateDepartment() throws Exception {
-		EntityManager em = emf.createEntityManager();
+	public void testAddNewDepartment() throws Exception {
 		
 		Department d = new Department();
 		d.setName("finanzas");
-		
-		em.getTransaction().begin();
-			em.persist(d);
-		em.getTransaction().commit();
+
+		EntityManager em = emf.createEntityManager();
+		Departments depts = new Departments(em);
+		depts.addNewDepartment(d);
 		
 		// check in the DB using JDBC
 		int deptId = d.getId();
-		
-		
 		Statement statement = jdbcConnection.createStatement();
 		ResultSet rs = statement.executeQuery("SELECT COUNT(*) as total FROM Department d where d.id = "+deptId);
 		rs.next();
-		
 		assertEquals(1, rs.getInt("total"));
 	}
 	
 	@Test
-	public void testFindDepartment() throws SQLException {
+	public void testFindById() throws SQLException {
 		// insert a department previously with JDBC
 		Statement statement = jdbcConnection.createStatement();
 		statement.executeUpdate("INSERT INTO Department(name) values('finanzas')", Statement.RETURN_GENERATED_KEYS);
 		int deptId = getLastInsertedId(statement);
 
-		
 		EntityManager em = emf.createEntityManager();
-		
-		Department d = em.find(Department.class, deptId);
+		Departments depts = new Departments(em);
+		Department d = depts.findById(deptId);
 		
 		assertEquals(deptId, d.getId());
 		assertEquals("finanzas", d.getName());