public function testSaveExtraFilledId()
{
$uid = 123;
$this->userMock->expects($this->atLeastOnce())->method('getId')->willReturn($uid);
$this->resourceMock->expects($this->once())->method('getConnection')->willReturn($this->dbAdapterMock);
$this->dbAdapterMock->expects($this->once())->method('update');
$this->assertInstanceOf('Magento\\User\\Model\\ResourceModel\\User', $this->model->saveExtra($this->userMock, [1, 2, 3]));
}