@Test
	public void findEstudentInActiviteTest() throws InstanceNotFoundException {
		Activity a = activityService.find(0);
		for (Student s : a.getStudents()) {
			activityService.unEnrollsStudentToActivity(s, a);
		}
		Student s = familyService.findStudent(0);
		activityService.enrollmentStudentInActivity(s, a);

		assertTrue("Too many students in this activity", activityService
				.findStudents(a).size() == 1);
	}