Adapt to enable testing and add more tests

tests/stubs/ui-helpers.cpp

@@ -0,0 +1,55 @@
+#include "ui-helpers.hpp"
+
+class QObejct;
+
+namespace advss {
+
+QObject *HighlightWidget(QWidget *widget, QColor startColor, QColor endColor,
+			 bool once)
+{
+	return nullptr;
+}
+
+void SetHeightToContentHeight(QListWidget *list) {}
+
+void SetButtonIcon(QAbstractButton *button, const char *path) {}
+
+int FindIdxInRagne(QComboBox *list, int start, int stop,
+		   const std::string &value, Qt::MatchFlags flags)
+{
+	return -1;
+}
+
+void SetRowMatchingValueVisible(QComboBox *list, const QString &value,
+				bool show)
+{
+}
+
+bool DisplayMessage(const QString &msg, bool question, bool modal)
+{
+	return false;
+}
+
+void DisplayTrayMessage(const QString &title, const QString &msg,
+			const QIcon &icon)
+{
+}
+
+std::string GetThemeTypeName()
+{
+	return "Dark";
+}
+
+void QueueUITask(void (*task)(void *param), void *) {}
+
+QWidget *GetSettingsWindow()
+{
+	return nullptr;
+}
+
+bool IsCursorInWidgetArea(QWidget *widget)
+{
+	return false;
+}
+
+} // namespace advss