MAGETWO-86044: Fix import grouped products #12853

Author: ishakhsuvarov

app/code/Magento/GroupedImportExport/Model/Import/Product/Type/Grouped.php

@@ -89,7 +89,7 @@ public function saveData()
                 foreach ($associatedSkusAndQtyPairs as $associatedSkuAndQty) {
                     ++$position;
                     $associatedSkuAndQty = explode(self::SKU_QTY_DELIMITER, $associatedSkuAndQty);
-                    $associatedSku = isset($associatedSkuAndQty[0]) ? trim($associatedSkuAndQty[0]) : null;
+                    $associatedSku = isset($associatedSkuAndQty[0]) ? strtolower(trim($associatedSkuAndQty[0])) : null;
                     if (isset($newSku[$associatedSku])) {
                         $linkedProductId = $newSku[$associatedSku][$this->getProductEntityIdentifierField()];
                     } elseif (isset($oldSku[$associatedSku])) {
@@ -99,7 +99,7 @@ public function saveData()
                     }
                     $scope = $this->_entityModel->getRowScope($rowData);
                     if (Product::SCOPE_DEFAULT == $scope) {
-                        $productData = $newSku[$rowData[Product::COL_SKU]];
+                        $productData = $newSku[strtolower($rowData[Product::COL_SKU])];
                     } else {
                         $colAttrSet = Product::COL_ATTR_SET;
                         $rowData[$colAttrSet] = $productData['attr_set_code'];

app/code/Magento/GroupedImportExport/Test/Unit/Model/Import/Product/Type/GroupedTest.php

@@ -192,7 +192,7 @@ public function saveDataProvider()
                 'skus' => [
                     'newSku' => [
                         'sku_assoc1' => ['entity_id' => 1],
-                        'productSku' => ['entity_id' => 3, 'attr_set_code' => 'Default', 'type_id' => 'grouped']
+                        'productsku' => ['entity_id' => 3, 'attr_set_code' => 'Default', 'type_id' => 'grouped']
                     ],
                     'oldSku' => ['sku_assoc2' => ['entity_id' => 2]]
                 ],
@@ -205,7 +205,7 @@ public function saveDataProvider()
             [
                 'skus' => [
                     'newSku' => [
-                        'productSku' => ['entity_id' => 1, 'attr_set_code' => 'Default', 'type_id' => 'grouped']
+                        'productsku' => ['entity_id' => 1, 'attr_set_code' => 'Default', 'type_id' => 'grouped']
                     ],
                     'oldSku' => []
                 ],
@@ -247,7 +247,7 @@ public function testSaveDataScopeStore()
     {
         $this->entityModel->expects($this->once())->method('getNewSku')->will($this->returnValue([
             'sku_assoc1' => ['entity_id' => 1],
-            'productSku' => ['entity_id' => 2, 'attr_set_code' => 'Default', 'type_id' => 'grouped']
+            'productsku' => ['entity_id' => 2, 'attr_set_code' => 'Default', 'type_id' => 'grouped']
         ]));
         $this->entityModel->expects($this->once())->method('getOldSku')->will($this->returnValue([
             'sku_assoc2' => ['entity_id' => 3]