MAGETWO-72861: Category edit performance issue - for 2.3

- Update unit tests;

Author: adifucan

app/code/Magento/CatalogRule/Test/Unit/Model/Indexer/IndexBuilder/ProductLoaderTest.php

@@ -87,7 +87,7 @@ public function testGetProducts()
             ->method('getList')
             ->with($this->searchCriteria)
             ->willReturn($this->productSearchResultsInterface);
-        $iterator = new \ArrayIterator([$this->product]);
+        $iterator = [$this->product];
         $this->productSearchResultsInterface->expects($this->once())
             ->method('getItems')
             ->willReturn($iterator);

app/code/Magento/CatalogRule/Test/Unit/Model/Indexer/IndexBuilderTest.php

@@ -255,7 +255,7 @@ public function testUpdateCatalogRuleGroupWebsiteData()
             ->method('getBackend')
             ->will($this->returnValue($backendModelMock));
 
-        $iterator = new \ArrayIterator([$this->product]);
+        $iterator = [$this->product];
         $this->productLoader->expects($this->once())
             ->method('getProducts')
             ->willReturn($iterator);