--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/unit/cli/test_calls.py	Sun Feb 11 23:21:07 2024 +0100
@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+
+# Libervia: an XMPP client
+# Copyright (C) 2009-2024 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+from unittest.mock import MagicMock, patch
+
+from PyQt6.QtWidgets import QApplication
+import pytest
+
+from libervia.cli.call_gui import AVCallGUI
+from libervia.frontends.tools import display_servers
+
+
+@pytest.fixture(scope="session")
+def qapplication():
+    # QApplication is needed to instantiate any QWidget
+    return QApplication([])
+
+
+@pytest.fixture
+def av_call_gui(qapplication):
+    host = MagicMock()
+    icons_path = MagicMock()
+    gui = AVCallGUI(host, icons_path)
+    gui.webrtc_call = MagicMock()
+    return gui
+
+
+def test_toggle_fullscreen(av_call_gui):
+    """``toggle_fullscreen`` changes window state."""
+    initial_state = av_call_gui.isFullScreen()
+    av_call_gui.toggle_fullscreen()
+    assert av_call_gui.isFullScreen() != initial_state
+
+
+def test_toggle_video(av_call_gui):
+    """``toggle_video`` actually toggles video state."""
+    av_call_gui.webrtc_call.webrtc = MagicMock(video_muted=False)
+    av_call_gui.toggle_video()
+    assert av_call_gui.webrtc_call.webrtc.video_muted is True
+
+
+def test_toggle_audio(av_call_gui):
+    """``toggle_audio`` actually toggles audio state."""
+    av_call_gui.webrtc_call.webrtc = MagicMock(audio_muted=False)
+    av_call_gui.toggle_audio()
+    assert av_call_gui.webrtc_call.webrtc.audio_muted is True
+
+
+def test_share_desktop(av_call_gui):
+    """``share_desktop`` changes WebRTC ``desktop_sharing`` state."""
+    av_call_gui.webrtc_call.webrtc = MagicMock(desktop_sharing=False)
+    # We test WAYLAND as it is a direct change of ``desktop_sharing`` state.
+    with patch(
+        "libervia.cli.call_gui.display_servers.detect",
+        return_value=display_servers.WAYLAND,
+    ):
+        av_call_gui.share_desktop()
+        assert av_call_gui.webrtc_call.webrtc.desktop_sharing is True
+
+
+def test_hang_up(av_call_gui):
+    """Hang-up button triggers window close."""
+    with patch.object(av_call_gui, "close") as mock_close:
+        av_call_gui.hang_up()
+    mock_close.assert_called_once()