@Test
public void testSave() {
SimpleStudentRepository smRepository = new SimpleStudentRepository();
Student s1 = new Student();
s1.setNumber(20);
s1.setFirstName("Upeksha");
s1.setLastName("Dimuthu");
s1.setAddress("Home");
smRepository.save(s1);
Student s2 = smRepository.find(20);
assertEquals("Errorrr ", s1.getNumber(), s2.getNumber());
assertEquals("Errorrr ", s1.getFirstName(), s2.getFirstName());
assertEquals("Errorrr ", s1.getLastName(), s2.getLastName());
assertEquals("Errorrr ", s1.getAddress(), s2.getAddress());
}