Add decrease test for upsert with value

Author: abnegate

tests/e2e/Adapter/Base.php

@@ -2396,6 +2396,21 @@ public function testCreateOrUpdateDocumentsWithIncrease(): void
         foreach ($documents as $document) {
             $this->assertEquals(6, $document->getAttribute('integer'));
         }
+
+        $documents[0]->setAttribute('integer', -1);
+        $documents[1]->setAttribute('integer', -1);
+
+        static::getDatabase()->createOrUpdateDocumentsWithIncrease(
+            collection: $collection,
+            attribute:'integer',
+            documents: $documents
+        );
+
+        $documents = static::getDatabase()->find($collection);
+
+        foreach ($documents as $document) {
+            $this->assertEquals(5, $document->getAttribute('integer'));
+        }
     }
 
     public function testCreateOrUpdateDocumentsPermissions(): void