Базовые модели перенесены в отдельное простраинство имён

Поправлены именования классов (хз, почему оно прежде работало)

tests/codeception/api/unit/models/base/KeyConfirmationFormTest.php

@@ -0,0 +1,62 @@
+<?php
+namespace tests\codeception\api\models\base;
+
+use api\models\base\KeyConfirmationForm;
+use Codeception\Specify;
+use tests\codeception\api\unit\DbTestCase;
+use tests\codeception\common\fixtures\EmailActivationFixture;
+use Yii;
+
+/**
+ * @property array $emailActivations
+ */
+class KeyConfirmationFormTest extends DbTestCase {
+    use Specify;
+
+    public function fixtures() {
+        return [
+            'emailActivations' => [
+                'class' => EmailActivationFixture::class,
+                'dataFile' => '@tests/codeception/common/fixtures/data/email-activations.php',
+            ],
+        ];
+    }
+
+    protected function createModel($key = null) {
+        return new KeyConfirmationForm([
+            'key' => $key,
+        ]);
+    }
+
+    public function testEmptyKey() {
+        $model = $this->createModel();
+        $this->specify('get error.key_is_required with validating empty key field', function () use ($model) {
+            expect('model should don\'t pass validation', $model->validate())->false();
+            expect('error messages should be set', $model->errors)->equals([
+                'key' => [
+                    'error.key_is_required',
+                ],
+            ]);
+        });
+    }
+
+    public function testIncorrectKey() {
+        $model = $this->createModel('not-exists-key');
+        $this->specify('get error.key_not_exists with validation wrong key', function () use ($model) {
+            expect('model should don\'t pass validation', $model->validate())->false();
+            expect('error messages should be set', $model->errors)->equals([
+                'key' => [
+                    'error.key_not_exists',
+                ],
+            ]);
+        });
+    }
+
+    public function testCorrectKey() {
+        $model = $this->createModel($this->emailActivations[0]['key']);
+        $this->specify('no errors if key exists', function () use ($model) {
+            expect('model should pass validation', $model->validate())->true();
+        });
+    }
+
+}