### Question:
UserManagementImpl implements UserManagementService { @Override public CommonResult getUserById(Integer id) { User user = userMapper.get(id); return CommonResult.success(user); }  @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 testGetUserById() throws Exception { }