MC-29026: GraphQL returns filters with some data if you making request to not existing or empty category

Author: Oleksandr Iegorov

dev/tests/api-functional/testsuite/Magento/GraphQl/Catalog/ProductSearchTest.php

@@ -31,6 +31,37 @@
  */
 class ProductSearchTest extends GraphQlAbstract
 {
+    /**
+     * Verify that filters for non-existing category are empty
+     *
+     * @throws \Exception
+     */
+    public function testFilterForNonExistingCategory()
+    {
+        $query = <<<QUERY
+{
+  products(filter: {category_id: {eq: "99999999"}}) {
+    filters {
+      name  
+    }
+  }
+}
+QUERY;
+
+        $response = $this->graphQlQuery($query);
+
+        $this->assertArrayHasKey(
+            'filters',
+            $response['products'],
+            'Filters are missing in product query result.'
+        );
+
+        $this->assertEmpty(
+            $response['products']['filters'],
+            'Returned filters data set does not empty'
+        );
+    }
+
     /**
      * Verify that layered navigation filters and aggregations are correct for product query
      *