Adds tests for update, delete and list

It also moves transaction management out of Departments.

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

 package dgpena.siexample.persistence;
 
+import java.util.List;
+
 import javax.persistence.EntityManager;
 
 public class Departments {
@@ -11,12 +13,18 @@ public class Departments {
 	}
 	
 	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);
 	}
+
+	public void deleteDepartment(Department d) {
+		em.remove(d);
+	}
+
+	public List<Department> findAll() {
+		return em.createQuery("SELECT d FROM Department d").getResultList();
+	}
 }

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

 package dgpena.siexample.persistence;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 
 import javax.persistence.EntityManager;
 import javax.persistence.EntityManagerFactory;
@@ -22,6 +27,7 @@ public class DepartmentsTest extends SQLBasedTest {
 		emf = Persistence.createEntityManagerFactory("si-database");
 	}
 	
+
 	@Test
 	public void testAddNewDepartment() throws Exception {
 		
@@ -30,7 +36,9 @@ public class DepartmentsTest extends SQLBasedTest {
 
 		EntityManager em = emf.createEntityManager();
 		Departments depts = new Departments(em);
+		em.getTransaction().begin();
 			depts.addNewDepartment(d);
+		em.getTransaction().commit();
 		
 		// check in the DB using JDBC
 		int deptId = d.getId();
@@ -55,4 +63,76 @@ public class DepartmentsTest extends SQLBasedTest {
 		assertEquals("finanzas", d.getName());
 		
 	}
+	
+	@Test
+	public void testUpdateDepartment() 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();
+		Departments depts = new Departments(em);
+		Department d = depts.findById(deptId);
+		
+		em.getTransaction().begin();
+			d.setName("contabilidad");
+		em.getTransaction().commit();
+		
+		// check in the DB using JDBC
+		statement = jdbcConnection.createStatement();
+		ResultSet rs = statement.executeQuery("SELECT * FROM Department d where d.id = "+deptId);
+		rs.next();
+		assertEquals("contabilidad", rs.getString("name"));
+
+	}
+	
+	@Test
+	public void testDeleteDepartment() 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();
+		Departments depts = new Departments(em);
+		Department d = depts.findById(deptId);
+		
+		em.getTransaction().begin();
+			depts.deleteDepartment(d);
+		em.getTransaction().commit();
+		
+		// check in the DB using JDBC
+		statement = jdbcConnection.createStatement();
+		ResultSet rs = statement.executeQuery("SELECT COUNT(*) as total FROM Department d where d.id = "+deptId);
+		rs.next();
+		assertEquals(0, rs.getInt("total"));
+	}
+	
+	@Test
+	public void testFindAllDepartments() throws SQLException {
+		// insert a department previously with JDBC
+		Statement statement = jdbcConnection.createStatement();
+		statement.executeUpdate("DELETE FROM Department", Statement.RETURN_GENERATED_KEYS);
+		
+		statement = jdbcConnection.createStatement();
+		statement.executeUpdate("INSERT INTO Department(name) values('dept-1')", Statement.RETURN_GENERATED_KEYS);
+		
+		statement = jdbcConnection.createStatement();
+		statement.executeUpdate("INSERT INTO Department(name) values('dept-2')", Statement.RETURN_GENERATED_KEYS);
+		
+		EntityManager em = emf.createEntityManager();
+		Departments depts = new Departments(em);
+		List<Department> departments = depts.findAll();
+		
+		assertEquals(2, departments.size());
+		
+		Set<String> namesToTest = new HashSet(Arrays.asList("dept-1", "dept-2"));
+		for (Department d: departments) {
+			namesToTest.remove(d.getName());
+		}
+		
+		assertTrue(namesToTest.isEmpty());
+	}
+	
 }