### Question:
UserManagementImpl implements UserManagementService { @Override public CommonResult listAllUsersAndRoles(){ JSONObject returnJson = new JSONObject(); List<User> users = userMapper.listAllUsersAndRoles(); returnJson.put("users", users); return CommonResult.success(returnJson); }  @Override CommonResult getUserById(Integer id); @Override CommonResult insertUser(User user); @Override CommonResult updateUserById(User user); @Override CommonResult deleteUserById(Integer id); @Override CommonResult listAllUsersAndRoles(); @Override CommonResult listAllRolesByDepartmentId(Integer departmentId);  }### Answer:
@Test public void testListAllUsersAndRoles() throws Exception { }