MAGETWO-51951: SQL Error when cloning product with custom option with CatalogStaging enabled

- fix test

Author: mslabko

dev/tests/integration/testsuite/Magento/Catalog/Model/Product/Attribute/Backend/SkuTest.php

@@ -38,13 +38,18 @@ public function testGenerateUniqueSkuNotExistingProduct($product)
     }
 
     /**
-     * @param $product \Magento\Catalog\Model\Product
-     * @dataProvider uniqueLongSkuDataProvider
+     * @magentoDataFixture Magento/Catalog/_files/product_simple.php
      * @magentoAppArea adminhtml
      * @magentoDbIsolation enabled
      */
-    public function testGenerateUniqueLongSku($product)
+    public function testGenerateUniqueLongSku()
     {
+        $repository = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
+            'Magento\Catalog\Model\ProductRepository'
+        );
+        $product = $repository->get('simple');
+        $product->setSku('0123456789012345678901234567890123456789012345678901234567890123');
+
         /** @var \Magento\Catalog\Model\Product\Copier $copier */
         $copier = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(
             'Magento\Catalog\Model\Product\Copier'
@@ -66,19 +71,6 @@ public function uniqueSkuDataProvider()
         return [[$product]];
     }
 
-    /**
-     * Returns simple product
-     *
-     * @return array
-     */
-    public function uniqueLongSkuDataProvider()
-    {
-        $product = $this->_getProduct();
-        $product->setSku('0123456789012345678901234567890123456789012345678901234567890123');
-        //strlen === 64
-        return [[$product]];
-    }
-
     /**
      * Get product form data provider
      *