Fix X11 display lifecycle leaks in text injection

tests/test_desktop_x11.py

@@ -0,0 +1,70 @@
+import sys
+import unittest
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+ROOT = Path(__file__).resolve().parents[1]
+SRC = ROOT / "src"
+if str(SRC) not in sys.path:
+    sys.path.insert(0, str(SRC))
+
+from desktop_x11 import X11Adapter
+
+
+class DesktopX11Tests(unittest.TestCase):
+    def _adapter(self) -> X11Adapter:
+        return object.__new__(X11Adapter)
+
+    @patch("desktop_x11.display.Display")
+    def test_paste_clipboard_closes_display_on_success(self, display_cls):
+        adapter = self._adapter()
+        display_obj = MagicMock()
+        display_cls.return_value = display_obj
+        adapter._send_combo = MagicMock()
+
+        adapter._paste_clipboard()
+
+        adapter._send_combo.assert_called_once_with(display_obj, ["Control_L", "Shift_L", "v"])
+        display_obj.close.assert_called_once_with()
+
+    @patch("desktop_x11.display.Display")
+    def test_paste_clipboard_closes_display_on_send_error(self, display_cls):
+        adapter = self._adapter()
+        display_obj = MagicMock()
+        display_cls.return_value = display_obj
+        adapter._send_combo = MagicMock(side_effect=RuntimeError("boom"))
+
+        with self.assertRaisesRegex(RuntimeError, "boom"):
+            adapter._paste_clipboard()
+
+        display_obj.close.assert_called_once_with()
+
+    @patch("desktop_x11.display.Display")
+    def test_type_text_closes_display_on_success(self, display_cls):
+        adapter = self._adapter()
+        display_obj = MagicMock()
+        display_cls.return_value = display_obj
+        adapter._send_combo = MagicMock()
+        adapter._keysym_for_char = MagicMock(return_value=(42, False))
+
+        adapter._type_text("a")
+
+        adapter._send_combo.assert_called_once_with(display_obj, [42], already_keysym=True)
+        display_obj.close.assert_called_once_with()
+
+    @patch("desktop_x11.display.Display")
+    def test_type_text_closes_display_on_send_error(self, display_cls):
+        adapter = self._adapter()
+        display_obj = MagicMock()
+        display_cls.return_value = display_obj
+        adapter._send_combo = MagicMock(side_effect=RuntimeError("boom"))
+        adapter._keysym_for_char = MagicMock(return_value=(42, False))
+
+        with self.assertRaisesRegex(RuntimeError, "boom"):
+            adapter._type_text("a")
+
+        display_obj.close.assert_called_once_with()
+
+
+if __name__ == "__main__":
+    unittest.main()