Error when testing the model: [yii\base\InvalidParamException] Table not found: []

I get this strange error when trying to run the unit test of the model.

Model:


<?php


namespace backend\modules\persons\models;


use Yii;


/**

 * This is the model class for table "{{%identitydocument}}".

 *

 * @property integer $ID

 * @property string $Name

 * @property integer $FISID

 */

class IdentityDocument extends \yii\db\ActiveRecord

{

    /**

     * @inheritdoc

     */

    public static function tableName()

    {

        return '{{%identitydocument}}';

    }


    /**

     * @inheritdoc

     */

    public function rules()

    {

        return [

            [['Name'], 'required'],

            [['Name'], 'string'],

            [['FISID'], 'integer']

        ];

    }


    /**

     * @inheritdoc

     */

    public function attributeLabels()

    {

        return [

            'ID' => Module::t('ML', 'ID'),

            'Name' => Module::t('ML', 'Name'),

            'FISID' => Module::t('ML', 'FISID'),

        ];

    }

}

Simple Unit test of the validation:


<?php

namespace tests\codeception\backend;


use tests\codeception\backend\unit\DbTestCase;

use backend\modules\persons\models\IdentityDocument;


class IdentityDocumentTest extends DbTestCase

{

    /**

     * @var \tests\codeception\backend\UnitTester

     */

    protected $identityDocument;


    protected function _before()

    {

    }


    protected function _after()

    {

    }


    // tests

    public function testNameIsRequired()

    {

        $this->identityDocument = new IdentityDocument();

        $this->identityDocument->Name = '';

        \PHPUnit_Framework_Assert::AssertFalse($this->identityDocument->validate(array('Name')));

    }

}

Full stacktrace:


Codeception PHP Testing Framework v2.2.0

Powered by PHPUnit 4.8.26 by Sebastian Bergmann and contributors.


[1mTests\codeception\backend.unit Tests (1) [22m-------------------

Modules: [32mAsserts, Db[39m

------------------------------------------------------------

[31;1mE[39;22m [35;1mIdentityDocumentTest:[39;22m Name is required 

------------------------------------------------------------




Time: 6.19 seconds, Memory: 11.75MB


There was 1 error:


---------

1) [35;1mIdentityDocumentTest:[39;22m Name is required

[37;41;1m Test [39;49;22m unit\IdentityDocumentTest.php:testNameIsRequired

[37;41;1m                                                        [39;49;22m

[37;41;1m  [yii\base\InvalidParamException] Table not found: []  [39;49;22m

[37;41;1m                                                        [39;49;22m

C:\projects\ais\vendor\yiisoft\yii2\db\Command.php:753

C:\projects\ais\vendor\yiisoft\yii2\test\InitDbFixture.php:94

C:\projects\ais\vendor\yiisoft\yii2\test\InitDbFixture.php:76

C:\projects\ais\vendor\yiisoft\yii2\test\FixtureTrait.php:114

C:\projects\ais\vendor\yiisoft\yii2-codeception\TestCase.php:85

C:\composer\vendor\phpunit\phpunit\src\Framework\TestCase.php:764

C:\composer\vendor\phpunit\phpunit\src\Framework\TestResult.php:612

C:\composer\vendor\phpunit\phpunit\src\Framework\TestCase.php:724

C:\composer\vendor\phpunit\phpunit\src\Framework\TestSuite.php:747

C:\composer\vendor\codeception\codeception\src\Codeception\PHPUnit\Runner.php:98

C:\composer\vendor\codeception\codeception\src\Codeception\SuiteManager.php:152

C:\composer\vendor\codeception\codeception\src\Codeception\Codecept.php:209

C:\composer\vendor\codeception\codeception\src\Codeception\Codecept.php:178

C:\composer\vendor\codeception\codeception\src\Codeception\Command\Run.php:329

C:\composer\vendor\codeception\codeception\src\Codeception\Command\Run.php:256

C:\composer\vendor\symfony\console\Command\Command.php:259

C:\composer\vendor\symfony\console\Application.php:844

C:\composer\vendor\symfony\console\Application.php:192

C:\composer\vendor\symfony\console\Application.php:123

C:\composer\vendor\codeception\codeception\src\Codeception\Application.php:103

C:\composer\vendor\codeception\codeception\codecept:33




[37;41mFAILURES![0m

[37;41mTests: 1[0m[37;41m, Assertions: 0[0m[37;41m, Errors: 1[0m[37;41m.[0m

What it might mean - "Table not found"? Which table? How can I test the model?