Use QGuiApplication in tests

Author: adazem009

test/common.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <QCoreApplication>
+#include <QGuiApplication>
 #include <gtest/gtest.h>
 #include <filesystem>
 #include <fstream>
@@ -20,7 +20,7 @@ std::string readFileStr(const std::string &fileName)
 
 int main(int argc, char **argv)
 {
-    QCoreApplication a(argc, argv);
+    QGuiApplication a(argc, argv);
     std::filesystem::current_path(DATA_DIR);
     ::testing::InitGoogleTest(&argc, argv);
     return RUN_ALL_TESTS();