code: def test_single_content_layout():
      """Test that returning a single dict also works (does not have to be returned in a list)."""
  
      class TestContentComponent(EmptyFlow):
          def __init__(self):
              super().__init__()
              self.component0 = EmptyFlow()
              self.component1 = EmptyFlow()
  
          def configure_layout(self):
              return {"name": "single", "content": self.component1}
  
      root = TestContentComponent()
      LightningApp(root)
      assert root._layout == [
          {"name": "single", "content": "root.component1"}
      ]
  
imports: from re import escape
  from unittest import mock
  from unittest.mock import Mock
  import pytest
  from lightning.app import LightningApp, LightningFlow
  from lightning.app.frontend.stream_lit import StreamlitFrontend
  from lightning.app.frontend.web import StaticWebFrontend
  from lightning.app.runners import MultiProcessRuntime
  from lightning.app.testing.helpers import EmptyFlow
  from lightning.app.utilities.imports import _IS_WINDOWS
label_desc: Use image node_id 8 for calling a global function with example usage: test_single_content_layout() and returns: dict