夹具不可用于后续测试

我正在使用Codeception和fixture来测试我的API,但这些fixture似乎只在第一次测试中可用。以下是我的测试:

class ActionCest extends BaseTestCase
{
    public function _fixtures()
    {
        return [
            'profiles' => [
                'class' => UserFixture::className(),
                // fixture data located in tests/_data/user.php
                'dataFile' => codecept_data_dir() . 'user.php'
            ],
            'actions' => [
                'class' => ActionFixture::className(),
                'dataFile' => codecept_data_dir() . 'action.php'
            ],
        ];
    }

    public function createAction(ApiTester $I)
    {
        $user = $I->grabFixture('profiles', 'user1');

        $I->wantTo('Add action');
        $I->haveHttpHeader('Authorization', 'Bearer '. $user['auth_key']);

        $payload = [
            'action_id' => 123,
            'saved' => true,
            'viewed' => false,
            'complete' => false,
        ];

        $I->sendPOST('/action/save', $payload);
        $I->seeResponseCodeIs(\Codeception\Util\HttpCode::OK); // 200
        $I->seeResponseContainsJson($this->buildResponsePayload($payload));
    }

    public function getAction(ApiTester $I)
    {
        $user = $I->grabFixture('profiles', 'user1');
        //$action = $I->grabFixture('actions', 'action1');

        $I->wantTo('Retrieve action');
        $I->haveHttpHeader('Authorization', 'Bearer '. $user['auth_key']);

        $I->sendPOST('/action/get-by-id/1');//'. $action['action_id']);
        $I->seeResponseCodeIs(\Codeception\Util\HttpCode::OK); // 200
        $I->seeResponseContainsJson($this->buildResponsePayload($payload));
    }
}

我如何克服这个问题?