diff --git a/api/models/profile/ChangeUsernameForm.php b/api/models/profile/ChangeUsernameForm.php
index fb0a931..9e7dd53 100644
--- a/api/models/profile/ChangeUsernameForm.php
+++ b/api/models/profile/ChangeUsernameForm.php
@@ -28,15 +28,19 @@ class ChangeUsernameForm extends ApiForm {
         ];
     }
 
-    public function change() {
+    public function change() : bool {
         if (!$this->validate()) {
             return false;
         }
 
-        $transaction = Yii::$app->db->beginTransaction();
         $account = $this->getAccount();
-        $oldNickname = $account->username;
+        if ($this->username === $account->username) {
+            return true;
+        }
+
+        $transaction = Yii::$app->db->beginTransaction();
         try {
+            $oldNickname = $account->username;
             $account->username = $this->username;
             if (!$account->save()) {
                 throw new ErrorException('Cannot save account model with new username');
diff --git a/tests/codeception/api/codeception.yml b/tests/codeception/api/codeception.yml
index 4318152..92cfc34 100644
--- a/tests/codeception/api/codeception.yml
+++ b/tests/codeception/api/codeception.yml
@@ -1,5 +1,6 @@
 namespace: tests\codeception\api
 actor: Tester
+params: [env]
 paths:
     tests: .
     log: _output
diff --git a/tests/codeception/api/functional.suite.yml b/tests/codeception/api/functional.suite.yml
index 01d3dc2..713312d 100644
--- a/tests/codeception/api/functional.suite.yml
+++ b/tests/codeception/api/functional.suite.yml
@@ -4,6 +4,7 @@ modules:
         - Filesystem
         - Yii2
         - tests\codeception\common\_support\FixtureHelper
+        - tests\codeception\common\_support\amqp\Helper
         - Redis
         - Asserts
         - REST:
@@ -11,8 +12,8 @@ modules:
     config:
         Yii2:
             configFile: '../config/api/functional.php'
-            cleanup: true
+            cleanup: false
         Redis:
-            host: testredis
+            host: "%REDIS_HOST%"
             port: 6379
             database: 0
diff --git a/tests/codeception/api/unit.suite.yml b/tests/codeception/api/unit.suite.yml
index 8ce2d31..3d31363 100644
--- a/tests/codeception/api/unit.suite.yml
+++ b/tests/codeception/api/unit.suite.yml
@@ -3,6 +3,8 @@ modules:
     enabled:
         - Yii2:
             part: [orm, email, fixtures]
+        - tests\codeception\common\_support\amqp\Helper
     config:
         Yii2:
             configFile: '../config/api/unit.php'
+            cleanup: false
diff --git a/tests/codeception/api/unit/models/authentication/ConfirmEmailFormTest.php b/tests/codeception/api/unit/models/authentication/ConfirmEmailFormTest.php
index 1fd318b..2bbd5d7 100644
--- a/tests/codeception/api/unit/models/authentication/ConfirmEmailFormTest.php
+++ b/tests/codeception/api/unit/models/authentication/ConfirmEmailFormTest.php
@@ -25,9 +25,15 @@ class ConfirmEmailFormTest extends TestCase {
         $this->assertInstanceOf(AccountSession::class, $result->getSession(), 'session was generated');
         $activationExists = EmailActivation::find()->andWhere(['key' => $fixture['key']])->exists();
         $this->assertFalse($activationExists, 'email activation key is not exist');
-        /** @var Account $user */
-        $user = Account::findOne($fixture['account_id']);
-        $this->assertEquals(Account::STATUS_ACTIVE, $user->status, 'user status changed to active');
+        /** @var Account $account */
+        $account = Account::findOne($fixture['account_id']);
+        $this->assertEquals(Account::STATUS_ACTIVE, $account->status, 'user status changed to active');
+
+        $message = $this->tester->grabLastSentAmqpMessage('events');
+        $body = json_decode($message->getBody(), true);
+        $this->assertEquals($account->id, $body['accountId']);
+        $this->assertEquals($account->username, $body['newUsername']);
+        $this->assertNull($body['oldUsername']);
     }
 
     private function createModel($key) {
diff --git a/tests/codeception/api/unit/models/profile/ChangeEmail/ConfirmNewEmailFormTest.php b/tests/codeception/api/unit/models/profile/ChangeEmail/ConfirmNewEmailFormTest.php
index 68ab6c4..3ac9e26 100644
--- a/tests/codeception/api/unit/models/profile/ChangeEmail/ConfirmNewEmailFormTest.php
+++ b/tests/codeception/api/unit/models/profile/ChangeEmail/ConfirmNewEmailFormTest.php
@@ -18,9 +18,8 @@ class ConfirmNewEmailFormTest extends TestCase {
     }
 
     public function testChangeEmail() {
-        $accountId = $this->tester->grabFixture('accounts', 'account-with-change-email-finish-state')['id'];
         /** @var Account $account */
-        $account = Account::findOne($accountId);
+        $account = Account::findOne($this->getAccountId());
         $newEmailConfirmationFixture = $this->tester->grabFixture('emailActivations', 'newEmailConfirmation');
         $model = new ConfirmNewEmailForm($account, [
             'key' => $newEmailConfirmationFixture['key'],
@@ -32,6 +31,23 @@ class ConfirmNewEmailFormTest extends TestCase {
         ]));
         $data = unserialize($newEmailConfirmationFixture['_data']);
         $this->assertEquals($data['newEmail'], $account->email);
+        $this->tester->canSeeAmqpMessageIsCreated('events');
+    }
+
+    public function testCreateTask() {
+        /** @var Account $account */
+        $account = Account::findOne($this->getAccountId());
+        $model = new ConfirmNewEmailForm($account);
+        $model->createTask(1, 'test1@ely.by', 'test@ely.by');
+        $message = $this->tester->grabLastSentAmqpMessage('events');
+        $body = json_decode($message->getBody(), true);
+        $this->assertEquals(1, $body['accountId']);
+        $this->assertEquals('test1@ely.by', $body['newEmail']);
+        $this->assertEquals('test@ely.by', $body['oldEmail']);
+    }
+
+    private function getAccountId() {
+        return $this->tester->grabFixture('accounts', 'account-with-change-email-finish-state')['id'];
     }
 
 }
diff --git a/tests/codeception/api/unit/models/profile/ChangeUsernameFormTest.php b/tests/codeception/api/unit/models/profile/ChangeUsernameFormTest.php
index a41dd75..158b17e 100644
--- a/tests/codeception/api/unit/models/profile/ChangeUsernameFormTest.php
+++ b/tests/codeception/api/unit/models/profile/ChangeUsernameFormTest.php
@@ -35,6 +35,7 @@ class ChangeUsernameFormTest extends TestCase {
         $this->assertTrue($model->change());
         $this->assertEquals('my_new_nickname', Account::findOne($this->getAccountId())->username);
         $this->assertInstanceOf(UsernameHistory::class, UsernameHistory::findOne(['username' => 'my_new_nickname']));
+        $this->tester->canSeeAmqpMessageIsCreated('events');
     }
 
     public function testChangeWithoutChange() {
@@ -49,7 +50,8 @@ class ChangeUsernameFormTest extends TestCase {
             'AND',
             'username' => $username,
             ['>=', 'applied_in', $callTime],
-        ]), 'no new UsernameHistory record, if we don\'t change nickname');
+        ]), 'no new UsernameHistory record, if we don\'t change username');
+        $this->tester->cantSeeAmqpMessageIsCreated('events');
     }
 
     public function testChangeCase() {
@@ -65,13 +67,17 @@ class ChangeUsernameFormTest extends TestCase {
             UsernameHistory::findOne(['username' => $newUsername]),
             'username should change, if we change case of some letters'
         );
+        $this->tester->canSeeAmqpMessageIsCreated('events');
     }
 
     public function testCreateTask() {
         $model = new ChangeUsernameForm();
-        $model->createEventTask('1', 'test1', 'test');
-        // TODO: у меня пока нет идей о том, чтобы это как-то успешно протестировать, увы
-        // но по крайней мере можно убедиться, что оно не падает где-то на этом шаге
+        $model->createEventTask(1, 'test1', 'test');
+        $message = $this->tester->grabLastSentAmqpMessage('events');
+        $body = json_decode($message->getBody(), true);
+        $this->assertEquals(1, $body['accountId']);
+        $this->assertEquals('test1', $body['newUsername']);
+        $this->assertEquals('test', $body['oldUsername']);
     }
 
     private function getAccountId() {
diff --git a/tests/codeception/common/_support/amqp/Helper.php b/tests/codeception/common/_support/amqp/Helper.php
new file mode 100644
index 0000000..bea9e03
--- /dev/null
+++ b/tests/codeception/common/_support/amqp/Helper.php
@@ -0,0 +1,106 @@
+<?php
+namespace tests\codeception\common\_support\amqp;
+
+use Codeception\Exception\ModuleException;
+use Codeception\Module;
+use Codeception\Module\Yii2;
+use Codeception\TestInterface;
+
+class Helper extends Module {
+
+    public function _before(TestInterface $test) {
+        /** @var \Codeception\Lib\Connector\Yii2 $connector */
+        $connector = $this->getYii2()->client;
+        $app = $connector->getApplication();
+        $app->set('amqp', [
+            'class' => TestComponent::class,
+        ]);
+
+        parent::_before($test);
+    }
+
+    /**
+     * Checks that message is created.
+     *
+     * ```php
+     * <?php
+     * // check that at least 1 message was created
+     * $I->seeAmqpMessageIsCreated();
+     *
+     * // check that only 3 messages were created
+     * $I->seeAmqpMessageIsCreated(3);
+     * ```
+     *
+     * @param string|null $exchange
+     * @param int|null    $num
+     */
+    public function seeAmqpMessageIsCreated($exchange = null, $num = null) {
+        if ($num === null) {
+            $this->assertNotEmpty($this->grabSentAmqpMessages($exchange), 'message were created');
+            return;
+        }
+
+        // TODO: заменить на assertCount() после релиза Codeception 2.2.7
+        // https://github.com/Codeception/Codeception/pull/3802
+        /** @noinspection PhpUnitTestsInspection */
+        $this->assertEquals(
+            $num,
+            count($this->grabSentAmqpMessages($exchange)),
+            'number of created messages is equal to ' . $num
+        );
+    }
+
+    /**
+     * Checks that no messages was created
+     *
+     * @param string|null $exchange
+     */
+    public function dontSeeAmqpMessageIsCreated($exchange = null) {
+        $this->seeAmqpMessageIsCreated($exchange, 0);
+    }
+
+    /**
+     * Returns last sent message
+     *
+     * @param string|null $exchange
+     * @return \PhpAmqpLib\Message\AMQPMessage
+     */
+    public function grabLastSentAmqpMessage($exchange = null) {
+        $this->seeAmqpMessageIsCreated();
+        $messages = $this->grabSentAmqpMessages($exchange);
+
+        return end($messages);
+    }
+
+    /**
+     * Returns array of all sent amqp messages.
+     * Each message is `\PhpAmqpLib\Message\AMQPMessage` instance.
+     * Useful to perform additional checks using `Asserts` module.
+     *
+     * @param string|null $exchange
+     * @return \PhpAmqpLib\Message\AMQPMessage[]
+     * @throws ModuleException
+     */
+    public function grabSentAmqpMessages($exchange = null) {
+        $amqp = $this->grabComponent('amqp');
+        if (!$amqp instanceof TestComponent) {
+            throw new ModuleException($this, 'AMQP module is not mocked, can\'t test messages');
+        }
+
+        return $amqp->getSentMessages($exchange);
+    }
+
+    private function grabComponent(string $component) {
+        return $this->getYii2()->grabComponent($component);
+    }
+
+    private function getYii2() : Yii2 {
+        $yii2 = $this->getModule('Yii2');
+        if (!$yii2 instanceof Yii2) {
+            throw new ModuleException($this, 'Yii2 module must be configured');
+        }
+
+        return $yii2;
+    }
+
+}
diff --git a/tests/codeception/common/_support/RabbitMQComponent.php b/tests/codeception/common/_support/amqp/TestComponent.php
similarity index 50%
rename from tests/codeception/common/_support/RabbitMQComponent.php
rename to tests/codeception/common/_support/amqp/TestComponent.php
index 4c8fc3a..9b8e159 100644
--- a/tests/codeception/common/_support/RabbitMQComponent.php
+++ b/tests/codeception/common/_support/amqp/TestComponent.php
@@ -1,10 +1,16 @@
 <?php
-namespace tests\codeception\common\_support;
+namespace tests\codeception\common\_support\amqp;
 
 use common\components\RabbitMQ\Component;
 use PhpAmqpLib\Connection\AbstractConnection;
 
-class RabbitMQComponent extends Component {
+class TestComponent extends Component {
+
+    private $sentMessages = [];
+
+    public function init() {
+        \yii\base\Component::init();
+    }
 
     public function getConnection() {
         /** @noinspection MagicMethodsValidityInspection */
@@ -27,7 +33,26 @@ class RabbitMQComponent extends Component {
     }
 
     public function sendToExchange($exchangeName, $routingKey, $message, $exchangeArgs = [], $publishArgs = []) {
-        // ничего не делаем
+        $this->sentMessages[$exchangeName][] = $this->prepareMessage($message);
+    }
+
+    /**
+     * @param string|null $exchangeName
+     * @return \PhpAmqpLib\Message\AMQPMessage[]
+     */
+    public function getSentMessages(string $exchangeName = null) : array {
+        if ($exchangeName !== null) {
+            return $this->sentMessages[$exchangeName] ?? [];
+        } else {
+            $messages = [];
+            foreach($this->sentMessages as $exchangeGroup) {
+                foreach ($exchangeGroup as $message) {
+                    $messages[] = $message;
+                }
+            }
+
+            return $messages;
+        }
     }
 
 }
diff --git a/tests/codeception/common/codeception.yml b/tests/codeception/common/codeception.yml
index f81585b..ff6249c 100644
--- a/tests/codeception/common/codeception.yml
+++ b/tests/codeception/common/codeception.yml
@@ -1,5 +1,6 @@
 namespace: tests\codeception\common
 actor: Tester
+params: [env]
 paths:
     tests: .
     log: _output
diff --git a/tests/codeception/common/unit.suite.yml b/tests/codeception/common/unit.suite.yml
index d072b09..98fb59d 100644
--- a/tests/codeception/common/unit.suite.yml
+++ b/tests/codeception/common/unit.suite.yml
@@ -6,3 +6,4 @@ modules:
     config:
         Yii2:
             configFile: '../config/common/unit.php'
+            cleanup: false
diff --git a/tests/codeception/config/config.php b/tests/codeception/config/config.php
index fe8a64c..2904804 100644
--- a/tests/codeception/config/config.php
+++ b/tests/codeception/config/config.php
@@ -17,8 +17,5 @@ return [
             // Для тестов нам не сильно важна безопасность, а вот время прохождения тестов значительно сокращается
             'passwordHashCost' => 4,
         ],
-        'amqp' => [
-            'class' => tests\codeception\common\_support\RabbitMQComponent::class,
-        ],
     ],
 ];
diff --git a/tests/codeception/console/codeception.yml b/tests/codeception/console/codeception.yml
index 14c972e..57e8496 100644
--- a/tests/codeception/console/codeception.yml
+++ b/tests/codeception/console/codeception.yml
@@ -1,5 +1,6 @@
 namespace: tests\codeception\console
 actor: Tester
+params: [env]
 paths:
     tests: .
     log: _output
diff --git a/tests/codeception/console/unit.suite.yml b/tests/codeception/console/unit.suite.yml
index 3ac6f10..bdcb10b 100644
--- a/tests/codeception/console/unit.suite.yml
+++ b/tests/codeception/console/unit.suite.yml
@@ -6,3 +6,4 @@ modules:
     config:
         Yii2:
             configFile: '../config/console/unit.php'
+            cleanup: false