diff --git a/tests/unit/extensions/elasticsearch/ActiveRecordTest.php b/tests/unit/extensions/elasticsearch/ActiveRecordTest.php
index 2d31792..8d3db69 100644
--- a/tests/unit/extensions/elasticsearch/ActiveRecordTest.php
+++ b/tests/unit/extensions/elasticsearch/ActiveRecordTest.php
@@ -47,6 +47,7 @@ class ActiveRecordTest extends ElasticSearchTestCase
 		if ($db->createCommand()->indexExists('yiitest')) {
 			$db->createCommand()->deleteIndex('yiitest');
 		}
+		$db->createCommand()->createIndex('yiitest');
 
 		$command = $db->createCommand();
 		Customer::setUpMapping($command);
@@ -54,6 +55,8 @@ class ActiveRecordTest extends ElasticSearchTestCase
 		Order::setUpMapping($command);
 		OrderItem::setUpMapping($command);
 
+		$db->createCommand()->flushIndex('yiitest');
+
 		$customer = new Customer();
 		$customer->id = 1;
 		$customer->setAttributes(['email' => 'user1@example.com', 'name' => 'user1', 'address' => 'address1', 'status' => 1], false);
diff --git a/tests/unit/framework/ar/ActiveRecordTestTrait.php b/tests/unit/framework/ar/ActiveRecordTestTrait.php
index e54df3f..338217b 100644
--- a/tests/unit/framework/ar/ActiveRecordTestTrait.php
+++ b/tests/unit/framework/ar/ActiveRecordTestTrait.php
@@ -487,6 +487,37 @@ trait ActiveRecordTestTrait
 	public function testFindEagerViaRelationPreserveOrder()
 	{
 		/** @var TestCase|ActiveRecordTestTrait $this */
+
+		/*
+		Item (name, category_id)
+		Order (customer_id, create_time, total)
+		OrderItem (order_id, item_id, quantity, subtotal)
+
+		Result should be the following:
+
+		Order 1: 1, 1325282384, 110.0
+		- orderItems:
+			OrderItem: 1, 1, 1, 30.0
+			OrderItem: 1, 2, 2, 40.0
+		- itemsInOrder:
+			Item 1: 'Agile Web Application Development with Yii1.1 and PHP5', 1
+			Item 2: 'Yii 1.1 Application Development Cookbook', 1
+
+		Order 2: 2, 1325334482, 33.0
+		- orderItems:
+			OrderItem: 2, 3, 1, 8.0
+			OrderItem: 2, 4, 1, 10.0
+			OrderItem: 2, 5, 1, 15.0
+		- itemsInOrder:
+			Item 5: 'Cars', 2
+			Item 3: 'Ice Age', 2
+			Item 4: 'Toy Story', 2
+		Order 3: 2, 1325502201, 40.0
+		- orderItems:
+			OrderItem: 3, 2, 1, 40.0
+		- itemsInOrder:
+			Item 3: 'Ice Age', 2
+		 */
 		$orders = $this->callOrderFind()->with('itemsInOrder1')->orderBy('create_time')->all();
 		$this->assertEquals(3, count($orders));