add expandfolder step in getFolderNode

Author: dididy

zeppelin-web-angular/e2e/models/folder-rename-page.ts

@@ -66,6 +66,13 @@ export class FolderRenamePage extends BasePage {
       })
     });
 
+    const folderNode = await this.getFolderNode(folderName);
+    // Ensure folder node is visible (expand if needed)
+    if (!(await folderNode.isVisible())) {
+      this.clickE2ETestFolder();
+      await folderNode.waitFor({ state: 'visible' });
+    }
+
     await expect(node.first()).toBeVisible();
     return node.first();
   }