Map<String, Object> employeeData = new HashMap<String, Object>();
employeeData.put("EmployeeId", "1");
ArrayList<Map<String, Object>> employeesData = new ArrayList<Map<String, Object>>();
employeesData.add(employeeData);
final ODataResponse response = new JsonEntityProvider().writeLinks(entitySet, employeesData, DEFAULT_PROPERTIES);
assertNotNull(response);
assertNotNull(response.getEntity());
assertNull("EntitypProvider must not set content header", response.getContentHeader());
final String json = StringHelper.inputStreamToString((InputStream) response.getEntity());