⏫ Forwardport of #11817 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/11817.patch (created by @p-bystritsky) based on commit(s):
  1. 550434e
  2. 566cc7f
  3. f0be8db
  4. de5990a

Fixed GitHub Issues in 2.3-develop branch:
  - #8970: Cannot assign products to categories not under tree root (reported by @marius-bica)

app/code/Magento/CatalogUrlRewrite/Model/ProductScopeRewriteGenerator.php

@@ -207,8 +207,9 @@ public function generateForSpecificStoreView($storeId, $productCategories, Produ
      */
     public function isCategoryProperForGenerating(Category $category, $storeId)
     {
-        if ($category->getParentId() != \Magento\Catalog\Model\Category::TREE_ROOT_ID) {
-            list(, $rootCategoryId) = $category->getParentIds();
+        $parentIds = $category->getParentIds();
+        if (count($parentIds) >= 2) {
+            $rootCategoryId = $parentIds[1];
             return $rootCategoryId == $this->storeManager->getStore($storeId)->getRootCategoryId();
         }
         return false;

app/code/Magento/CatalogUrlRewrite/Test/Unit/Model/ProductScopeRewriteGeneratorTest.php

@@ -47,6 +47,9 @@ class ProductScopeRewriteGeneratorTest extends \PHPUnit\Framework\TestCase
     /** @var \Magento\Framework\Serialize\Serializer\Json|\PHPUnit_Framework_MockObject_MockObject */
     private $serializer;
 
+    /** @var \Magento\Catalog\Model\Category|\PHPUnit_Framework_MockObject_MockObject */
+    private $categoryMock;
+
     public function setUp()
     {
         $this->serializer = $this->createMock(\Magento\Framework\Serialize\Serializer\Json::class);
@@ -83,6 +86,10 @@ function ($value) {
         $this->storeViewService = $this->getMockBuilder(\Magento\CatalogUrlRewrite\Service\V1\StoreViewService::class)
             ->disableOriginalConstructor()->getMock();
         $this->storeManager = $this->createMock(StoreManagerInterface::class);
+        $storeRootCategoryId = 2;
+        $store = $this->getMockBuilder(\Magento\Store\Model\Store::class)->disableOriginalConstructor()->getMock();
+        $store->expects($this->any())->method('getRootCategoryId')->will($this->returnValue($storeRootCategoryId));
+        $this->storeManager->expects($this->any())->method('getStore')->will($this->returnValue($store));
         $mergeDataProviderFactory = $this->createPartialMock(
             \Magento\UrlRewrite\Model\MergeDataProviderFactory::class,
             ['create']
@@ -103,6 +110,7 @@ function ($value) {
                 'mergeDataProviderFactory' => $mergeDataProviderFactory
             ]
         );
+        $this->categoryMock = $this->getMockBuilder(Category::class)->disableOriginalConstructor()->getMock();
     }
 
     public function testGenerationForGlobalScope()
@@ -112,12 +120,6 @@ public function testGenerationForGlobalScope()
         $product->expects($this->any())->method('getStoreIds')->will($this->returnValue([1]));
         $this->storeViewService->expects($this->once())->method('doesEntityHaveOverriddenUrlKeyForStore')
             ->will($this->returnValue(false));
-        $categoryMock = $this->getMockBuilder(Category::class)
-            ->disableOriginalConstructor()
-            ->getMock();
-        $categoryMock->expects($this->once())
-            ->method('getParentId')
-            ->willReturn(1);
         $this->initObjectRegistryFactory([]);
         $canonical = new \Magento\UrlRewrite\Service\V1\Data\UrlRewrite([], $this->serializer);
         $canonical->setRequestPath('category-1')
@@ -149,25 +151,21 @@ public function testGenerationForGlobalScope()
                 'category-3_3' => $current,
                 'category-4_4' => $anchorCategories
             ],
-            $this->productScopeGenerator->generateForGlobalScope([$categoryMock], $product, 1)
+            $this->productScopeGenerator->generateForGlobalScope([$this->categoryMock], $product, 1)
         );
     }
 
     public function testGenerationForSpecificStore()
     {
+        $storeRootCategoryId = 2;
+        $category_id = 4;
         $product = $this->createMock(\Magento\Catalog\Model\Product::class);
         $product->expects($this->any())->method('getStoreId')->will($this->returnValue(1));
         $product->expects($this->never())->method('getStoreIds');
-        $storeRootCategoryId = 'root-for-store-id';
-        $category = $this->createMock(\Magento\Catalog\Model\Category::class);
-        $category->expects($this->any())->method('getParentIds')
+        $this->categoryMock->expects($this->any())->method('getParentIds')
             ->will($this->returnValue(['root-id', $storeRootCategoryId]));
-        $category->expects($this->any())->method('getParentId')->will($this->returnValue('parent_id'));
-        $category->expects($this->any())->method('getId')->will($this->returnValue('category_id'));
-        $store = $this->getMockBuilder(\Magento\Store\Model\Store::class)->disableOriginalConstructor()->getMock();
-        $store->expects($this->any())->method('getRootCategoryId')->will($this->returnValue($storeRootCategoryId));
-        $this->storeManager->expects($this->any())->method('getStore')->will($this->returnValue($store));
-        $this->initObjectRegistryFactory([$category]);
+        $this->categoryMock->expects($this->any())->method('getId')->will($this->returnValue($category_id));
+        $this->initObjectRegistryFactory([$this->categoryMock]);
         $canonical = new \Magento\UrlRewrite\Service\V1\Data\UrlRewrite([], $this->serializer);
         $canonical->setRequestPath('category-1')
             ->setStoreId(1);
@@ -184,7 +182,7 @@ public function testGenerationForSpecificStore()
 
         $this->assertEquals(
             ['category-1_1' => $canonical],
-            $this->productScopeGenerator->generateForSpecificStoreView(1, [$category], $product, 1)
+            $this->productScopeGenerator->generateForSpecificStoreView(1, [$this->categoryMock], $product, 1)
         );
     }
 
@@ -212,4 +210,40 @@ protected function initObjectRegistryFactory($entities)
             ->with(['entities' => $entities])
             ->will($this->returnValue($objectRegistry));
     }
+
+    /**
+     * Test the possibility of url rewrite generation.
+     *
+     * @param array $parentIds
+     * @param bool $expectedResult
+     * @dataProvider isCategoryProperForGeneratingDataProvider
+     */
+    public function testIsCategoryProperForGenerating($parentIds, $expectedResult)
+    {
+        $storeId = 1;
+        $this->categoryMock->expects(self::any())->method('getParentIds')->willReturn($parentIds);
+        $result = $this->productScopeGenerator->isCategoryProperForGenerating(
+            $this->categoryMock,
+            $storeId
+        );
+        self::assertEquals(
+            $expectedResult,
+            $result
+        );
+    }
+
+    /**
+     * Data provider for testIsCategoryProperForGenerating.
+     *
+     * @return array
+     */
+    public function isCategoryProperForGeneratingDataProvider()
+    {
+        return [
+            [['0'], false],
+            [['1'], false],
+            [['1', '2'], true],
+            [['1', '3'], false],
+        ];
+    }
 }

dev/tests/integration/testsuite/Magento/CatalogUrlRewrite/_files/product_with_category.php

@@ -79,4 +79,4 @@
 
 /** @var CategoryLinkManagementInterface $linkManagement */
 $linkManagement = $objectManager->get(CategoryLinkManagementInterface::class);
-$linkManagement->assignProductToCategories($product->getSku(), [$category->getEntityId()]);
+$linkManagement->assignProductToCategories($product->getSku(), [Category::TREE_ROOT_ID, $category->getEntityId()]);