[BUGFIX][11022] set function scope to private, fix unit tests

Author: David

app/code/Magento/Eav/Model/AttributeSetRepository.php

@@ -128,7 +128,7 @@ public function getList(\Magento\Framework\Api\SearchCriteriaInterface $searchCr
      * @param \Magento\Eav\Model\ResourceModel\Entity\Attribute\Set\Collection $collection
      * @return void
      */
-    protected function addFilterGroupToCollection(
+    private function addFilterGroupToCollection(
         \Magento\Framework\Api\Search\FilterGroup $filterGroup,
         \Magento\Eav\Model\ResourceModel\Entity\Attribute\Set\Collection $collection
     ) {

app/code/Magento/Eav/Test/Unit/Model/AttributeSetRepositoryTest.php

@@ -212,7 +212,7 @@ public function testGetList()
         $searchCriteriaMock = $this->getMock('\Magento\Framework\Api\SearchCriteriaInterface');
 
         $filterGroupMock = $this->getMock('\Magento\Framework\Api\Search\FilterGroup', [], [], '', false);
-        $searchCriteriaMock->expects($this->once())->method('getFilterGroups')->willReturn([$filterGroupMock]);
+        $searchCriteriaMock->expects($this->exactly(2))->method('getFilterGroups')->willReturn([$filterGroupMock]);
 
         $filterMock = $this->getMock('\Magento\Framework\Api\Filter', [], [], '', false);
         $filterGroupMock->expects($this->once())->method('getFilters')->willReturn([$filterMock]);
@@ -273,7 +273,7 @@ public function testGetList()
     public function testGetListIfEntityTypeCodeIsNull()
     {
         $searchCriteriaMock = $this->getMock('\Magento\Framework\Api\SearchCriteriaInterface');
-        $searchCriteriaMock->expects($this->once())->method('getFilterGroups')->willReturn([]);
+        $searchCriteriaMock->expects($this->exactly(2))->method('getFilterGroups')->willReturn([]);
 
         $collectionMock = $this->getMock(
             '\Magento\Eav\Model\ResourceModel\Entity\Attribute\Set\Collection',