From f40cdc12fafbcf3fe7f2d39581d08018be3cb44e Mon Sep 17 00:00:00 2001
From: "v.shatylo" <v.shatylo@ism-ukraine.com>
Date: Fri, 18 Jan 2019 15:41:57 +0200
Subject: [PATCH 1/2] magento/magento2#12194: Tier price on configurable
 product sorting sometimes-wrong

---
 .../Magento/Catalog/Model/ResourceModel/Product/Collection.php  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/code/Magento/Catalog/Model/ResourceModel/Product/Collection.php b/app/code/Magento/Catalog/Model/ResourceModel/Product/Collection.php
index 749a3d754570f..7db77faaafcaf 100644
--- a/app/code/Magento/Catalog/Model/ResourceModel/Product/Collection.php
+++ b/app/code/Magento/Catalog/Model/ResourceModel/Product/Collection.php
@@ -2205,7 +2205,7 @@ private function getTierPriceSelect(array $productIds)
             $this->getLinkField() . ' IN(?)',
             $productIds
         )->order(
-            $this->getLinkField()
+            'qty'
         );
         return $select;
     }

From 25f231166e7f336e899b054569e979e121c79744 Mon Sep 17 00:00:00 2001
From: Pavel Bystritsky <p.bystritsky@yandex.ru>
Date: Wed, 30 Jan 2019 16:38:22 +0200
Subject: [PATCH 2/2] ENGCOM-4015: Static test fix.

---
 .../Test/Unit/Model/ResourceModel/Product/CollectionTest.php  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/code/Magento/Catalog/Test/Unit/Model/ResourceModel/Product/CollectionTest.php b/app/code/Magento/Catalog/Test/Unit/Model/ResourceModel/Product/CollectionTest.php
index dbbb3fb29513b..6d3316a0610cd 100644
--- a/app/code/Magento/Catalog/Test/Unit/Model/ResourceModel/Product/CollectionTest.php
+++ b/app/code/Magento/Catalog/Test/Unit/Model/ResourceModel/Product/CollectionTest.php
@@ -318,7 +318,7 @@ public function testAddTierPriceDataByGroupId()
                 [ '(customer_group_id=? AND all_groups=0) OR all_groups=1', $customerGroupId]
             )
             ->willReturnSelf();
-        $select->expects($this->once())->method('order')->with('entity_id')->willReturnSelf();
+        $select->expects($this->once())->method('order')->with('qty')->willReturnSelf();
         $this->connectionMock->expects($this->once())
             ->method('fetchAll')
             ->with($select)
@@ -370,7 +370,7 @@ public function testAddTierPriceData()
         $select->expects($this->exactly(1))->method('where')
             ->with('entity_id IN(?)', [1])
             ->willReturnSelf();
-        $select->expects($this->once())->method('order')->with('entity_id')->willReturnSelf();
+        $select->expects($this->once())->method('order')->with('qty')->willReturnSelf();
         $this->connectionMock->expects($this->once())
             ->method('fetchAll')
             ->with($select)