diff --git a/tests/codeception/common/fixtures/MojangUsernameFixture.php b/tests/codeception/common/fixtures/MojangUsernameFixture.php
index b27ef0c..c0e53d7 100644
--- a/tests/codeception/common/fixtures/MojangUsernameFixture.php
+++ b/tests/codeception/common/fixtures/MojangUsernameFixture.php
@@ -8,4 +8,6 @@ class MojangUsernameFixture extends ActiveFixture {
 
     public $modelClass = MojangUsername::class;
 
+    public $dataFile = '@tests/codeception/common/fixtures/data/mojang-usernames.php';
+
 }
diff --git a/tests/codeception/common/fixtures/OauthClientFixture.php b/tests/codeception/common/fixtures/OauthClientFixture.php
index e6dee18..5b0385f 100644
--- a/tests/codeception/common/fixtures/OauthClientFixture.php
+++ b/tests/codeception/common/fixtures/OauthClientFixture.php
@@ -8,6 +8,8 @@ class OauthClientFixture extends ActiveFixture {
 
     public $modelClass = OauthClient::class;
 
+    public $dataFile = '@tests/codeception/common/fixtures/data/oauth-clients.php';
+
     public $depends = [
         AccountFixture::class,
     ];
diff --git a/tests/codeception/common/fixtures/OauthSessionFixture.php b/tests/codeception/common/fixtures/OauthSessionFixture.php
index 77adb2a..0bbab87 100644
--- a/tests/codeception/common/fixtures/OauthSessionFixture.php
+++ b/tests/codeception/common/fixtures/OauthSessionFixture.php
@@ -9,6 +9,8 @@ class OauthSessionFixture extends ActiveFixture {
 
     public $modelClass = OauthSession::class;
 
+    public $dataFile = '@tests/codeception/common/fixtures/data/oauth-sessions.php';
+
     public $depends = [
         OauthClientFixture::class,
         AccountFixture::class,
diff --git a/tests/codeception/common/unit.suite.yml b/tests/codeception/common/unit.suite.yml
index a0582a5..8ce2d31 100644
--- a/tests/codeception/common/unit.suite.yml
+++ b/tests/codeception/common/unit.suite.yml
@@ -1,6 +1,8 @@
-# Codeception Test Suite Configuration
-
-# suite for unit (internal) tests.
-# RUN `build` COMMAND AFTER ADDING/REMOVING MODULES.
-
 class_name: UnitTester
+modules:
+    enabled:
+        - Yii2:
+            part: [orm, email, fixtures]
+    config:
+        Yii2:
+            configFile: '../config/api/unit.php'
diff --git a/tests/codeception/common/unit/DbTestCase.php b/tests/codeception/common/unit/DbTestCase.php
deleted file mode 100644
index 2159a69..0000000
--- a/tests/codeception/common/unit/DbTestCase.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace tests\codeception\common\unit;
-
-/**
- * @inheritdoc
- */
-class DbTestCase extends \yii\codeception\DbTestCase
-{
-    public $appConfig = '@tests/codeception/config/common/unit.php';
-}
diff --git a/tests/codeception/common/unit/TestCase.php b/tests/codeception/common/unit/TestCase.php
index 8496a63..ef1be1f 100644
--- a/tests/codeception/common/unit/TestCase.php
+++ b/tests/codeception/common/unit/TestCase.php
@@ -1,8 +1,22 @@
 <?php
 namespace tests\codeception\common\unit;
 
-class TestCase extends \yii\codeception\TestCase {
+class TestCase extends \Codeception\Test\Unit  {
 
-    public $appConfig = '@tests/codeception/config/common/unit.php';
+    /**
+     * @var \tests\codeception\common\UnitTester
+     */
+    protected $tester;
+
+    /**
+     * Список фикстур, что будут загружены перед тестом, но после зачистки базы данных
+     *
+     * @url http://codeception.com/docs/modules/Yii2#fixtures
+     *
+     * @return array
+     */
+    public function _fixtures() {
+        return [];
+    }
 
 }
diff --git a/tests/codeception/common/unit/behaviors/DataBehaviorTest.php b/tests/codeception/common/unit/behaviors/DataBehaviorTest.php
index 6ffaa27..7a78e5b 100644
--- a/tests/codeception/common/unit/behaviors/DataBehaviorTest.php
+++ b/tests/codeception/common/unit/behaviors/DataBehaviorTest.php
@@ -13,23 +13,19 @@ class DataBehaviorTest extends TestCase {
     use ProtectedCaller;
 
     public function testSetKey() {
-        $this->specify('setting value should change model data field', function() {
-            $model = $this->createModel();
-            /** @var DataBehavior $behavior */
-            $behavior = $model->behaviors['dataBehavior'];
-            $this->callProtected($behavior, 'setKey', 'my-key', 'my-value');
-            expect($model->_data)->equals(serialize(['my-key' => 'my-value']));
-        });
+        $model = $this->createModel();
+        /** @var DataBehavior $behavior */
+        $behavior = $model->behaviors['dataBehavior'];
+        $this->callProtected($behavior, 'setKey', 'my-key', 'my-value');
+        $this->assertEquals(serialize(['my-key' => 'my-value']), $model->_data);
     }
 
     public function testGetKey() {
-        $this->specify('getting value from exists data should work', function() {
-            $model = $this->createModel();
-            $model->_data = serialize(['some-key' => 'some-value']);
-            /** @var DataBehavior $behavior */
-            $behavior = $model->behaviors['dataBehavior'];
-            expect($this->callProtected($behavior, 'getKey', 'some-key'))->equals('some-value');
-        });
+        $model = $this->createModel();
+        $model->_data = serialize(['some-key' => 'some-value']);
+        /** @var DataBehavior $behavior */
+        $behavior = $model->behaviors['dataBehavior'];
+        $this->assertEquals('some-value', $this->callProtected($behavior, 'getKey', 'some-key'));
     }
 
     public function testGetData() {
diff --git a/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php b/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php
index 5fbd663..5078acb 100644
--- a/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php
+++ b/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php
@@ -12,12 +12,10 @@ class EmailActivationExpirationBehaviorTest extends TestCase {
     use ProtectedCaller;
 
     public function testCalculateTime() {
-        $this->specify('just use create_time and plus passed time', function() {
-            $behavior = $this->createBehavior();
-            $time = time();
-            $behavior->owner->created_at = $time;
-            expect($this->callProtected($behavior, 'calculateTime', 10))->equals($time + 10);
-        });
+        $behavior = $this->createBehavior();
+        $time = time();
+        $behavior->owner->created_at = $time;
+        $this->assertEquals($time + 10, $this->callProtected($behavior, 'calculateTime', 10));
     }
 
     public function testCompareTime() {
diff --git a/tests/codeception/common/unit/models/AccountSessionTest.php b/tests/codeception/common/unit/models/AccountSessionTest.php
index 66a8f14..0e98803 100644
--- a/tests/codeception/common/unit/models/AccountSessionTest.php
+++ b/tests/codeception/common/unit/models/AccountSessionTest.php
@@ -1,35 +1,27 @@
 <?php
 namespace codeception\common\unit\models;
 
-use Codeception\Specify;
 use common\models\AccountSession;
 use tests\codeception\common\unit\TestCase;
 
 class AccountSessionTest extends TestCase {
-    use Specify;
 
     public function testGenerateRefreshToken() {
-        $this->specify('method call will set refresh_token value', function() {
-            $model = new AccountSession();
-            $model->generateRefreshToken();
-            expect($model->refresh_token)->notNull();
-        });
+        $model = new AccountSession();
+        $model->generateRefreshToken();
+        $this->assertNotNull($model->refresh_token, 'method call will set refresh_token value');
     }
 
     public function testSetIp() {
-        $this->specify('method should convert passed ip string to long', function() {
-            $model = new AccountSession();
-            $model->setIp('127.0.0.1');
-            expect($model->last_used_ip)->equals(2130706433);
-        });
+        $model = new AccountSession();
+        $model->setIp('127.0.0.1');
+        $this->assertEquals(2130706433, $model->last_used_ip, 'method should convert passed ip string to long');
     }
 
     public function testGetReadableIp() {
-        $this->specify('method should convert stored ip long into readable ip string', function() {
-            $model = new AccountSession();
-            $model->last_used_ip = 2130706433;
-            expect($model->getReadableIp())->equals('127.0.0.1');
-        });
+        $model = new AccountSession();
+        $model->last_used_ip = 2130706433;
+        $this->assertEquals('127.0.0.1', $model->getReadableIp(), 'method should convert stored long into readable ip');
     }
 
 }
diff --git a/tests/codeception/common/unit/models/AccountTest.php b/tests/codeception/common/unit/models/AccountTest.php
index 8bdb07d..a2078dc 100644
--- a/tests/codeception/common/unit/models/AccountTest.php
+++ b/tests/codeception/common/unit/models/AccountTest.php
@@ -6,27 +6,17 @@ use common\components\UserPass;
 use common\models\Account;
 use tests\codeception\common\fixtures\AccountFixture;
 use tests\codeception\common\fixtures\MojangUsernameFixture;
-use tests\codeception\common\unit\DbTestCase;
+use tests\codeception\common\unit\TestCase;
 use Yii;
 use const common\LATEST_RULES_VERSION;
 
-/**
- * @property array $accounts
- * @property array $mojangAccounts
- */
-class AccountTest extends DbTestCase {
+class AccountTest extends TestCase {
     use Specify;
 
-    public function fixtures() {
+    public function _fixtures() {
         return [
-            'accounts' => [
-                'class' => AccountFixture::class,
-                'dataFile' => '@tests/codeception/common/fixtures/data/accounts.php',
-            ],
-            'mojangAccounts' => [
-                'class' => MojangUsernameFixture::class,
-                'dataFile' => '@tests/codeception/common/fixtures/data/mojang-usernames.php',
-            ],
+            'accounts' => AccountFixture::class,
+            'mojangAccounts' => MojangUsernameFixture::class,
         ];
     }
 
@@ -73,7 +63,8 @@ class AccountTest extends DbTestCase {
         });
 
         $this->specify('username should be unique', function() {
-            $model = new Account(['username' => $this->accounts['admin']['username']]);
+            $model = new Account();
+            $model->username = $this->tester->grabFixture('accounts', 'admin')['username'];
             expect($model->validate('username'))->false();
             expect($model->getErrors('username'))->equals(['error.username_not_available']);
         });
@@ -111,7 +102,7 @@ class AccountTest extends DbTestCase {
         });
 
         $this->specify('email should be unique', function() {
-            $model = new Account(['email' => $this->accounts['admin']['email']]);
+            $model = new Account(['email' => $this->tester->grabFixture('accounts', 'admin')['email']]);
             expect($model->validate('email'))->false();
             expect($model->getErrors('email'))->equals(['error.email_not_available']);
         });
diff --git a/tests/codeception/common/unit/models/EmailActivationTest.php b/tests/codeception/common/unit/models/EmailActivationTest.php
index 8880e2d..d436b23 100644
--- a/tests/codeception/common/unit/models/EmailActivationTest.php
+++ b/tests/codeception/common/unit/models/EmailActivationTest.php
@@ -1,31 +1,35 @@
 <?php
 namespace codeception\common\unit\models;
 
-use Codeception\Specify;
-use common\models\confirmations\ForgotPassword;
-use common\models\confirmations\RegistrationConfirmation;
+use common\models\confirmations;
 use common\models\EmailActivation;
 use tests\codeception\common\fixtures\EmailActivationFixture;
-use tests\codeception\common\unit\DbTestCase;
+use tests\codeception\common\unit\TestCase;
 
-class EmailActivationTest extends DbTestCase {
-    use Specify;
+class EmailActivationTest extends TestCase {
 
-    public function fixtures() {
+    public function _fixtures() {
         return [
             'emailActivations' => EmailActivationFixture::class,
         ];
     }
 
     public function testInstantiate() {
-        $this->specify('return valid model type', function() {
-            expect(EmailActivation::findOne([
-                'type' => EmailActivation::TYPE_REGISTRATION_EMAIL_CONFIRMATION,
-            ]))->isInstanceOf(RegistrationConfirmation::class);
-            expect(EmailActivation::findOne([
-                'type' => EmailActivation::TYPE_FORGOT_PASSWORD_KEY,
-            ]))->isInstanceOf(ForgotPassword::class);
-        });
+        $this->assertInstanceOf(confirmations\RegistrationConfirmation::class, EmailActivation::findOne([
+            'type' => EmailActivation::TYPE_REGISTRATION_EMAIL_CONFIRMATION,
+        ]));
+
+        $this->assertInstanceOf(confirmations\ForgotPassword::class, EmailActivation::findOne([
+            'type' => EmailActivation::TYPE_FORGOT_PASSWORD_KEY,
+        ]));
+
+        $this->assertInstanceOf(confirmations\CurrentEmailConfirmation::class, EmailActivation::findOne([
+            'type' => EmailActivation::TYPE_CURRENT_EMAIL_CONFIRMATION,
+        ]));
+
+        $this->assertInstanceOf(confirmations\NewEmailConfirmation::class, EmailActivation::findOne([
+            'type' => EmailActivation::TYPE_NEW_EMAIL_CONFIRMATION,
+        ]));
     }
 
 }
diff --git a/tests/codeception/common/unit/validators/LanguageValidatorTest.php b/tests/codeception/common/unit/validators/LanguageValidatorTest.php
index 5d1b0ea..e40e72c 100644
--- a/tests/codeception/common/unit/validators/LanguageValidatorTest.php
+++ b/tests/codeception/common/unit/validators/LanguageValidatorTest.php
@@ -11,25 +11,18 @@ class LanguageValidatorTest extends TestCase {
     use ProtectedCaller;
 
     public function testGetFilesNames() {
-        $this->specify('get list of 2 languages: ru and en', function() {
-            $model = $this->createModelWithFixturePath();
-            expect($this->callProtected($model, 'getFilesNames'))->equals(['en', 'ru']);
-        });
+        $model = $this->createModelWithFixturePath();
+        $this->assertEquals(['en', 'ru'], $this->callProtected($model, 'getFilesNames'));
     }
 
-    public function testValidateValue() {
-        $this->specify('get null, because language is supported', function() {
-            $model = $this->createModelWithFixturePath();
-            expect($this->callProtected($model, 'validateValue', 'ru'))->null();
-        });
+    public function testValidateValueSupportedLanguage() {
+        $model = $this->createModelWithFixturePath();
+        $this->assertNull($this->callProtected($model, 'validateValue', 'ru'));
+    }
 
-        $this->specify('get error message, because language is unsupported', function() {
-            $model = $this->createModelWithFixturePath();
-            expect($this->callProtected($model, 'validateValue', 'by'))->equals([
-                $model->message,
-                [],
-            ]);
-        });
+    public function testValidateNotSupportedLanguage() {
+        $model = $this->createModelWithFixturePath();
+        $this->assertEquals([$model->message, []], $this->callProtected($model, 'validateValue', 'by'));
     }
 
     /**