diff --git a/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php b/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php
new file mode 100644
index 0000000..5fbd663
--- /dev/null
+++ b/tests/codeception/common/unit/behaviors/EmailActivationExpirationBehaviorTest.php
@@ -0,0 +1,111 @@
+<?php
+namespace codeception\common\unit\behaviors;
+
+use Codeception\Specify;
+use common\behaviors\EmailActivationExpirationBehavior;
+use tests\codeception\common\_support\ProtectedCaller;
+use tests\codeception\common\unit\TestCase;
+use yii\base\Model;
+
+class EmailActivationExpirationBehaviorTest extends TestCase {
+    use Specify;
+    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);
+        });
+    }
+
+    public function testCompareTime() {
+        $this->specify('expect false, if passed value is less then 0', function() {
+            $behavior = $this->createBehavior();
+            expect($this->callProtected($behavior, 'compareTime', -1))->false();
+        });
+
+        $this->specify('expect true, if passed value is equals 0', function() {
+            $behavior = $this->createBehavior();
+            expect($this->callProtected($behavior, 'compareTime', 0))->true();
+        });
+
+        $this->specify('expect true, if passed value is more than 0 and current time is greater then calculated', function() {
+            $behavior = $this->createBehavior();
+            $behavior->owner->created_at = time() - 10;
+            expect($this->callProtected($behavior, 'compareTime', 5))->true();
+        });
+
+        $this->specify('expect false, if passed value is more than 0 and current time is less then calculated', function() {
+            $behavior = $this->createBehavior();
+            $behavior->owner->created_at = time() - 2;
+            expect($this->callProtected($behavior, 'compareTime', 7))->false();
+        });
+    }
+
+    public function testCanRepeat() {
+        $this->specify('we can repeat, if created_at + repeatTimeout is greater, then current time', function() {
+            $behavior = $this->createBehavior();
+            $behavior->repeatTimeout = 30;
+            $behavior->owner->created_at = time() - 60;
+            expect($behavior->canRepeat())->true();
+        });
+
+        $this->specify('we cannot repeat, if created_at + repeatTimeout is less, then current time', function() {
+            $behavior = $this->createBehavior();
+            $behavior->repeatTimeout = 60;
+            $behavior->owner->created_at = time() - 30;
+            expect($behavior->canRepeat())->false();
+        });
+    }
+
+    public function testIsExpired() {
+        $this->specify('key is not expired, if created_at + expirationTimeout is greater, then current time', function() {
+            $behavior = $this->createBehavior();
+            $behavior->expirationTimeout = 30;
+            $behavior->owner->created_at = time() - 60;
+            expect($behavior->isExpired())->true();
+        });
+
+        $this->specify('key is not expired, if created_at + expirationTimeout is less, then current time', function() {
+            $behavior = $this->createBehavior();
+            $behavior->expirationTimeout = 60;
+            $behavior->owner->created_at = time() - 30;
+            expect($behavior->isExpired())->false();
+        });
+    }
+
+    public function testCanRepeatIn() {
+        $this->specify('get expected timestamp for repeat time moment', function() {
+            $behavior = $this->createBehavior();
+            $behavior->repeatTimeout = 30;
+            $behavior->owner->created_at = time() - 60;
+            expect($behavior->canRepeatIn())->equals($behavior->owner->created_at + $behavior->repeatTimeout);
+        });
+    }
+
+    public function testExpireIn() {
+        $this->specify('get expected timestamp for key expire moment', function() {
+            $behavior = $this->createBehavior();
+            $behavior->expirationTimeout = 30;
+            $behavior->owner->created_at = time() - 60;
+            expect($behavior->expireIn())->equals($behavior->owner->created_at + $behavior->expirationTimeout);
+        });
+    }
+
+    /**
+     * @return EmailActivationExpirationBehavior
+     */
+    private function createBehavior() {
+        $behavior = new EmailActivationExpirationBehavior();
+        /** @var Model $model */
+        $model = new class extends Model {
+            public $created_at;
+        };
+        $model->attachBehavior('email-activation-behavior', $behavior);
+
+        return $behavior;
+    }
+
+}