test for eager loading when there are 3 tables between the relation using via() to link it

tests/data/ar/Customer.php

@@ -44,6 +44,21 @@ class Customer extends ActiveRecord
         return $this->hasMany(Order::className(), ['customer_id' => 'id'])->orderBy('id');
     }
 
+    public function getOrderItems2()
+    {
+        return $this->hasMany(OrderItem::className(), ['order_id' => 'id'])->via('orders');
+    }
+
+    public function getItems()
+    {
+        return $this->hasMany(Item::className(), ['id' => 'item_id'])->via('orderItems2');
+    }
+
+    public function getCategories()
+    {
+        return $this->hasMany(Category::className(), ['id' => 'category_id'])->via('items');
+    }
+
     public function getExpensiveOrders()
     {
         return $this->hasMany(Order::className(), ['customer_id' => 'id'])->andWhere('[[total]] > 50')->orderBy('id');

tests/framework/ar/ActiveRecordTestTrait.php

@@ -1190,4 +1190,15 @@ trait ActiveRecordTestTrait
         $this->assertTrue(isset($items[4]));
         $this->assertTrue(isset($items[5]));
     }
+
+    public function testEagerLoadingWithViaRelation()
+    {
+        /* @var $this TestCase|ActiveRecordTestTrait */
+
+        /* @var $customerClass \yii\db\ActiveRecordInterface */
+        $customerClass = $this->getCustomerClass();
+        /** @var $customer \yii\db\ActiveRecord $customer */
+        $customer = $customerClass::find()->where(['id' => 1])->with(['categories'])->one();
+        $this->assertTrue($customer->isRelationPopulated('categories'));
+    }
 }