ENGCOM-4566: Prevent duplicate variation error during import of configurable products with numerical SKUs #21917

 - Merge Pull Request #21917 from alexander-aleman/magento2:configurable-import-numeric-skus
 - Merged commits:
   1. 1146503
   2. 97f683f
   3. e40c86a
   4. eaf3ab2

Author: magento-engcom-team

app/code/Magento/ConfigurableImportExport/Model/Import/Product/Type/Configurable.php

@@ -596,7 +596,7 @@ protected function _parseVariations($rowData)
                     $additionalRow['_super_attribute_position'] = $position;
                     $additionalRows[] = $additionalRow;
                     $additionalRow = [];
-                    $position += 1;
+                    $position ++;
                 }
             } else {
                 throw new LocalizedException(
@@ -937,7 +937,7 @@ public function isRowValid(array $rowData, $rowNum, $isNewProduct = true)
         }
         foreach ($dataWithExtraVirtualRows as $option) {
             if (isset($option['_super_products_sku'])) {
-                if (in_array($option['_super_products_sku'], $skus)) {
+                if (in_array($option['_super_products_sku'], $skus, true)) {
                     $error = true;
                     $this->_entityModel->addRowError(
                         sprintf(

app/code/Magento/ConfigurableImportExport/Test/Unit/Model/Import/Product/Type/ConfigurableTest.php

@@ -616,6 +616,83 @@ public function testIsRowValid()
         }
     }
 
+    public function testRowValidationForNumericalSkus()
+    {
+        // Set _attributes to avoid error in Magento\CatalogImportExport\Model\Import\Product\Type\AbstractType.
+        $this->setPropertyValue($this->configurable, '_attributes', [
+            'Default' => [],
+        ]);
+        // Avoiding errors about attributes not being super
+        $this->setPropertyValue(
+            $this->configurable,
+            '_superAttributes',
+            [
+                'testattr2' => [
+                    'options' => [
+                        'attr2val1' => 1,
+                        'attr2val2' => 2,
+                    ]
+                ],
+            ]
+        );
+
+        $rowValidationDataProvider = $this->rowValidationDataProvider();
+
+        // Checking that variations with duplicate sku are invalid
+        $result = $this->configurable->isRowValid($rowValidationDataProvider['duplicateProduct'], 0);
+        $this->assertFalse($result);
+
+        // Checking that variations with SKUs that are the same when interpreted as number,
+        // but different when interpreted as string are valid
+        $result = $this->configurable->isRowValid($rowValidationDataProvider['nonDuplicateProduct'], 0);
+        $this->assertTrue($result);
+    }
+
+    /**
+     * @return array
+     */
+    public function rowValidationDataProvider()
+    {
+        return [
+            'duplicateProduct' => [
+                'sku' => 'configurableNumericalSkuDuplicateVariation',
+                'store_view_code' => null,
+                'attribute_set_code' => 'Default',
+                'product_type' => 'configurable',
+                'name' => 'Configurable Product with duplicate numerical SKUs in variations',
+                'product_websites' => 'website_1',
+                'configurable_variation_labels' => 'testattr2=Select Configuration',
+                'configurable_variations' => 'sku=1234.1,'
+                    . 'testattr2=attr2val1,'
+                    . 'display=1|sku=1234.1,'
+                    . 'testattr2=attr2val1,'
+                    . 'display=0',
+                '_store' => null,
+                '_attribute_set' => 'Default',
+                '_type' => 'configurable',
+                '_product_websites' => 'website_1',
+            ],
+            'nonDuplicateProduct' => [
+                'sku' => 'configurableNumericalSkuNonDuplicateVariation',
+                'store_view_code' => null,
+                'attribute_set_code' => 'Default',
+                'product_type' => 'configurable',
+                'name' => 'Configurable Product with different numerical SKUs in variations',
+                'product_websites' => 'website_1',
+                'configurable_variation_labels' => 'testattr2=Select Configuration',
+                'configurable_variations' => 'sku=1234.10,'
+                    . 'testattr2=attr2val1,'
+                    . 'display=1|sku=1234.1,'
+                    . 'testattr2=attr2val2,'
+                    . 'display=0',
+                '_store' => null,
+                '_attribute_set' => 'Default',
+                '_type' => 'configurable',
+                '_product_websites' => 'website_1',
+            ]
+        ];
+    }
+
     /**
      * Set object property value.
      *