public void testEnsureTeacherServiceDeletesContact() {
        TeachersServiceAsync teachersServiceAsync = GWT.create(TeachersService.class);
        ServiceDefTarget target = (ServiceDefTarget) teachersServiceAsync;
        target.setServiceEntryPoint(GWT.getModuleBaseURL() + "teachers/teacherService");
        delayTestFinish(10000);

        LinkedList<TeacherDetails> expectedResult = new LinkedList<>();
        //expectedResult.add(new TeacherDetails("0", "Armindo Almeida", "ID-452"));
        //expectedResult.add(new TeacherDetails("1", "Manuel Ribeiro", "ID-789"));
        //expectedResult.add(new TeacherDetails("2", "José Paiva", "ID-120"));
        //expectedResult.add(new TeacherDetails("3", "Gracinda Soares", "ID-685"));

        ArrayList<String> idsToDelete = new ArrayList<>();
        idsToDelete.add("0");
        idsToDelete.add("1");
        idsToDelete.add("2");
        idsToDelete.add("3");

        teachersServiceAsync.deleteTeachers(idsToDelete, new AsyncCallback<ArrayList<TeacherDetails>>() {
            @Override
            public void onFailure(Throwable caught) {
                fail("Request failure: " + caught.getMessage());
            }

            @Override
            public void onSuccess(ArrayList<TeacherDetails> result) {
                assertEquals(expectedResult,result);
                finishTest();
            }
        });
    }

    public void testEnsureTeacherServiceDeletesAllContacts() {
        TeachersServiceAsync teachersServiceAsync = GWT.create(TeachersService.class);
        ServiceDefTarget target = (ServiceDefTarget) teachersServiceAsync;
        target.setServiceEntryPoint(GWT.getModuleBaseURL() + "teachers/teacherService");
        delayTestFinish(10000);

        LinkedList<TeacherDetails> expectedResult = new LinkedList<>();
        //expectedResult.add(new TeacherDetails("0", "Armindo Almeida", "ID-452"));
        //expectedResult.add(new TeacherDetails("1", "Manuel Ribeiro", "ID-789"));
        //expectedResult.add(new TeacherDetails("2", "José Paiva", "ID-120"));
        //expectedResult.add(new TeacherDetails("3", "Gracinda Soares", "ID-685"));

        ArrayList<String> idsToDelete = new ArrayList<>();
        idsToDelete.add("3");

        teachersServiceAsync.deleteTeachers(idsToDelete, new AsyncCallback<ArrayList<TeacherDetails>>() {
            @Override
            public void onFailure(Throwable caught) {
                fail("Request failure: " + caught.getMessage());
            }

            @Override
            public void onSuccess(ArrayList<TeacherDetails> result) {
                assertEquals(expectedResult,result);
                finishTest();
            }
        });
    }