Issue magento#15656: Duplicate product

- Fixed static and unit tests;

Author: Aliaksei Yakimovich2

app/code/Magento/Catalog/Model/Product/Copier.php

@@ -50,6 +50,7 @@ class Copier
     /**
      * @param CopyConstructorInterface $copyConstructor
      * @param \Magento\Catalog\Model\ProductFactory $productFactory
+     * @param ProductRepositoryInterface|null $productRepository
      */
     public function __construct(
         CopyConstructorInterface $copyConstructor,

app/code/Magento/Catalog/Test/Unit/Model/Product/CopierTest.php

@@ -101,6 +101,8 @@ public function testCopy()
             'product data' => ['product data'],
             ProductInterface::EXTENSION_ATTRIBUTES_KEY => $extensionAttributes,
         ];
+
+        $this->productMock->expects($this->once())->method('getStoreId')->willReturn(0);
         $this->productMock->expects($this->atLeastOnce())->method('getWebsiteIds');
         $this->productMock->expects($this->atLeastOnce())->method('getCategoryIds');
         $this->productMock->expects($this->any())->method('getData')->willReturnMap([