### Question:
UserManagementImpl implements UserManagementService { @Override public CommonResult updateUserById(User user) { if (userMapper.get(user.getId()) == null) { return CommonResult.fail(E_602); } int count = userMapper.update(user); if (count == 0) { return CommonResult.fail(); } return CommonResult.success(count); }  @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 testUpdateUserById() throws Exception { }