Реализованы формы для шагов смены E-mail адреса, покрыты unit-тестами

У EmailActivation добавлено поле $_data и дописано поведение для работы с ним
Упрощено подключение фикстур для EmailActivations

tests/codeception/common/unit/behaviors/DataBehaviorTest.php

@@ -0,0 +1,79 @@
+<?php
+namespace codeception\common\unit\behaviors;
+
+use Codeception\Specify;
+use common\behaviors\DataBehavior;
+use tests\codeception\common\_support\ProtectedCaller;
+use tests\codeception\common\unit\TestCase;
+use yii\base\ErrorException;
+use yii\base\Model;
+
+class DataBehaviorTest extends TestCase {
+    use Specify;
+    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']));
+        });
+    }
+
+    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');
+        });
+    }
+
+    public function testGetData() {
+        $this->specify('getting value from null field should return empty array', function() {
+            $model = $this->createModel();
+            /** @var DataBehavior $behavior */
+            $behavior = $model->behaviors['dataBehavior'];
+            expect($this->callProtected($behavior, 'getData'))->equals([]);
+        });
+
+        $this->specify('getting value from serialized data field should return encoded value', function() {
+            $model = $this->createModel();
+            $data = ['foo' => 'bar'];
+            $model->_data = serialize($data);
+            /** @var DataBehavior $behavior */
+            $behavior = $model->behaviors['dataBehavior'];
+            expect($this->callProtected($behavior, 'getData'))->equals($data);
+        });
+
+        $this->specify('getting value from invalid serialization string', function() {
+            $model = $this->createModel();
+            $model->_data = 'this is invalid serialization of string';
+            /** @var DataBehavior $behavior */
+            $behavior = $model->behaviors['dataBehavior'];
+            $this->expectException(ErrorException::class);
+            $this->callProtected($behavior, 'getData');
+        });
+    }
+
+    /**
+     * @return Model
+     */
+    private function createModel() {
+        return new class extends Model {
+            public $_data;
+
+            public function behaviors() {
+                return [
+                    'dataBehavior' => [
+                        'class' => DataBehavior::class,
+                    ],
+                ];
+            }
+        };
+    }
+
+}