MC-21542: Category query does not handle disabled children properly

- add test

Author: cpartica

dev/tests/integration/testsuite/Magento/Catalog/_files/categories_disabled.php

@@ -8,9 +8,27 @@
 
 $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
 
+// Adding 4th level ensures an edge case for which 3 levels of categories would not be enough
+$category = $objectManager->create(\Magento\Catalog\Model\Category::class);
+$category->isObjectNew(true);
+$category->setId(59)
+    ->setName('Category 1.1.1.1')
+    ->setParentId(5)
+    ->setPath('1/2/3/4/5/59')
+    ->setLevel(5)
+    ->setAvailableSortBy('name')
+    ->setDefaultSortBy('name')
+    ->setIsActive(true)
+    ->setPosition(1)
+    ->setCustomUseParentSettings(0)
+    ->setCustomDesign('Magento/blank')
+    ->setDescription('This is the description for Category 1.1.1.1')
+    ->save();
+
 /** @var $category \Magento\Catalog\Model\Category */
 $category = $objectManager->create(\Magento\Catalog\Model\Category::class);
 
+// Category 1.1.1
 $category->load(4);
 $category->setIsActive(false);
 $category->save();

dev/tests/integration/testsuite/Magento/Catalog/_files/categories_disabled_rollback.php

@@ -5,3 +5,20 @@
  */
 
 include __DIR__ . '/categories_rollback.php';
+
+$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+/** @var \Magento\Framework\Registry $registry */
+$registry = $objectManager->get(\Magento\Framework\Registry::class);
+
+$registry->unregister('isSecureArea');
+$registry->register('isSecureArea', true);
+
+/** @var Magento\Catalog\Model\ResourceModel\Category\Collection $collection */
+$collection = $objectManager->create(\Magento\Catalog\Model\ResourceModel\Category\Collection::class);
+foreach ($collection->addAttributeToFilter('level', ['in' => [59]]) as $category) {
+    /** @var \Magento\Catalog\Model\Category $category */
+    $category->delete();
+}
+
+$registry->unregister('isSecureArea');
+$registry->register('isSecureArea', false);