code: def test_unsplit():
      layout = Layout()
      layout.split(Layout(), Layout())
      assert len(layout.children) == 2
  
      layout.unsplit()
      assert len(layout.children) == 0
  
file_path: rich/tests/test_layout.py
imports: import sys
  import pytest
  from rich.console import Console
  from rich.layout import Layout, NoSplitter
  from rich.panel import Panel
label_desc: Use image node_id 3 for calling a global function with example usage: test_unsplit() without return types