Add tests for sidebar and themes

tests/test_gui/test_gui_sidebar.py

@@ -0,0 +1,53 @@
+"""
+novelWriter – Side Bar Class Tester
+===================================
+
+This file is a part of novelWriter
+Copyright (C) 2025 Veronica Berglyd Olsen and novelWriter contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+"""
+from __future__ import annotations
+
+import pytest
+
+from novelwriter import CONFIG
+from novelwriter.constants import nwLabels
+from novelwriter.enum import nwTheme
+
+
+@pytest.mark.gui
+def testGuiSideBar_CycleColourTheme(nwGUI):
+    """Test theme cycle feature on the side bar."""
+    CONFIG.themeMode = nwTheme.AUTO
+    sidebar = nwGUI.sideBar
+    sidebar.mainGui.checkThemeUpdate = lambda *a: None
+
+    # Run 3 Cycles
+    for _ in range(3):
+
+        # Cycle Light
+        sidebar._cycleColurTheme()
+        assert CONFIG.themeMode == nwTheme.LIGHT
+        assert sidebar.tbTheme.toolTip() == nwLabels.THEME_MODE_LABEL[nwTheme.LIGHT]
+
+        # Cycle Dark
+        sidebar._cycleColurTheme()
+        assert CONFIG.themeMode == nwTheme.DARK
+        assert sidebar.tbTheme.toolTip() == nwLabels.THEME_MODE_LABEL[nwTheme.DARK]
+
+        # Cycle Auto
+        sidebar._cycleColurTheme()
+        assert CONFIG.themeMode == nwTheme.AUTO
+        assert sidebar.tbTheme.toolTip() == nwLabels.THEME_MODE_LABEL[nwTheme.AUTO]