implement system fonts search for Linux

tests/Host/Linux/SystemFontsSearchTestsUbuntu.cpp

@@ -0,0 +1,28 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include <catch2/catch_all.hpp>
+#include "Base/Logger.hpp"
+#include "Host/SystemInfo.hpp"
+#include "Scene/Text/FontAtlasFactory.hpp"
+#include <filesystem>
+
+using namespace OpenVulkano;
+
+TEST_CASE("Search system fonts")
+{ 
+    Logger::SetupLogger("", "tests.log");
+
+    // assume these fonts are present since they are default
+	std::filesystem::path path = SystemInfo::GetSystemFontPath("Ubuntu-R");
+	REQUIRE(path == "/usr/share/fonts/truetype/ubuntu/Ubuntu-R.ttf");
+
+	path = SystemInfo::GetSystemFontPath("UbuntuMono-BI");
+	REQUIRE(!path.empty());
+
+	path = SystemInfo::GetSystemFontPath("NON-EXISTING Font");
+	REQUIRE(path.empty());
+}

tests/Host/Windows/SystemFontsSearchTests.cpp

@@ -10,7 +10,6 @@
 #include <filesystem>
 
 #include "Scene/Text/FontAtlasFactory.hpp"
-#include "Host/ResourceLoader.hpp"
 
 using namespace OpenVulkano;