diff --git a/tests/test_gui_custom_window.py b/tests/test_gui_custom_window.py
new file mode 100644
index 0000000..d966e72
--- /dev/null
+++ b/tests/test_gui_custom_window.py
@@ -0,0 +1,15 @@
+import pytest
+from unittest.mock import patch
+from src.gui_2 import App
+
+@patch("src.gui_2.immapp.run")
+@patch("src.gui_2.session_logger.close_session")
+@patch("src.gui_2.imgui.save_ini_settings_to_disk")
+@patch("sys.argv", ["gui_2.py"])
+def test_app_window_is_borderless(mock_save_ini, mock_close, mock_run):
+ app = App()
+ app.run()
+ 
+ assert app.runner_params is not None
+ # This assertion will fail initially because we haven't implemented it yet
+ assert getattr(app.runner_params.app_window_params, 'borderless', False) is True, "Window should be borderless"