Написан тест для поведения beforeSave модели EmailActivation

common/models/EmailActivation.php

@@ -64,7 +64,7 @@ class EmailActivation extends ActiveRecord {
     public static function instantiate($row) {
         $type = ArrayHelper::getValue($row, 'type');
         if ($type === null) {
-            return new static;
+            return parent::instantiate($row);
         }
 
         $classMap = self::getClassMap();
@@ -91,11 +91,19 @@ class EmailActivation extends ActiveRecord {
 
         if ($this->key === null) {
             do {
-                $this->key = UserFriendlyRandomKey::make();
+                $this->key = $this->generateKey();
-            } while (EmailActivation::find()->andWhere(['key' => $this->key])->exists());
+            } while ($this->isKeyExists($this->key));
         }
 
         return true;
     }
 
+    protected function generateKey() : string {
+        return UserFriendlyRandomKey::make();
+    }
+
+    protected function isKeyExists(string $key) : bool {
+        return self::find()->andWhere(['key' => $key])->exists();
+    }
+
 }

tests/codeception/common/unit/models/EmailActivationTest.php

@@ -28,4 +28,30 @@ class EmailActivationTest extends DbTestCase {
         });
     }
 
+    public function testBeforeSave() {
+        $this->specify('method should generate value for key field if it empty', function() {
+            $model = new EmailActivation();
+            $model->beforeSave(true);
+            expect($model->key)->notNull();
+        });
+
+        $this->specify('method should repeat code generation if code duplicate with exists', function() {
+            /** @var EmailActivation|\PHPUnit_Framework_MockObject_MockObject $model */
+            $model = $this->getMockBuilder(EmailActivation::class)
+                ->setMethods(['generateKey', 'isKeyExists'])
+                ->getMock();
+
+            $model->expects($this->exactly(3))
+                ->method('generateKey')
+                ->will($this->onConsecutiveCalls('1', '2', '3'));
+
+            $model->expects($this->exactly(3))
+                  ->method('isKeyExists')
+                  ->will($this->onConsecutiveCalls(true, true, false));
+
+            $model->beforeSave(true);
+            expect($model->key)->equals('3');
+        });
+    }
+
 }