diff --git a/tests/IO/FsUtils.cpp b/tests/IO/FsUtils.cpp
index c42c215..6ba75f2 100644
--- a/tests/IO/FsUtils.cpp
+++ b/tests/IO/FsUtils.cpp
@@ -88,4 +88,45 @@ TEST_CASE("GetDirSize", "[FsUtils]")
 	REQUIRE(FsUtils::GetDirSize(baseDir / "dir") == 2);
 
 	std::filesystem::remove_all(baseDir);
-}
\ No newline at end of file
+}
+
+TEST_CASE("ToValidFileName", "[FsUtils]")
+{
+	REQUIRE(FsUtils::ToValidFileName("file<name>") == "file＜name＞");
+	REQUIRE(FsUtils::ToValidFileName("file:name") == "file꞉name");
+	REQUIRE(FsUtils::ToValidFileName("file\"name\"") == "file＂name＂");
+	REQUIRE(FsUtils::ToValidFileName("file/name\\") == "file⁄name⧹");
+	REQUIRE(FsUtils::ToValidFileName("file|name") == "file｜name");
+	REQUIRE(FsUtils::ToValidFileName("file?name*") == "file？name∗");
+
+	REQUIRE(FsUtils::ToValidFileName("file~name") == "filename");
+	REQUIRE(FsUtils::ToValidFileName("file`name") == "filename");
+	REQUIRE(FsUtils::ToValidFileName("file!@#$%^&name") == "filename");
+	REQUIRE(FsUtils::ToValidFileName("file(name{name}") == "filenamename");
+	REQUIRE(FsUtils::ToValidFileName("file=name") == "filename");
+	REQUIRE(FsUtils::ToValidFileName("file+name,name") == "filenamename");
+
+	REQUIRE(FsUtils::ToValidFileName("  file name  ") == "file name");
+	REQUIRE(FsUtils::ToValidFileName("..file name..") == "file name");
+	REQUIRE(FsUtils::ToValidFileName(".file.") == "file");
+
+	REQUIRE(FsUtils::ToValidFileName("file    name") == "file name");
+	REQUIRE(FsUtils::ToValidFileName("file  name") == "file name");
+
+	REQUIRE(FsUtils::ToValidFileName("") == "unnamed_file");
+	REQUIRE(FsUtils::ToValidFileName("    ") == "unnamed_file");
+	REQUIRE(FsUtils::ToValidFileName("...") == "unnamed_file");
+
+	std::string long_name(300, 'a');
+	REQUIRE(FsUtils::ToValidFileName(long_name).length() == 255);
+
+	std::string utf8_name = "name_" + std::string(250, 'a') + "∗";
+	REQUIRE(FsUtils::ToValidFileName(utf8_name).back() == 'a');
+
+	REQUIRE(FsUtils::ToValidFileName("<>:/\\|?*") == "＜＞꞉⁄⧹｜？∗");
+	REQUIRE(FsUtils::ToValidFileName("~~~~") == "unnamed_file");
+	REQUIRE(FsUtils::ToValidFileName("..") == "unnamed_file");
+
+	REQUIRE(FsUtils::ToValidFileName("file:name<>") == "file꞉name＜＞");
+	REQUIRE(FsUtils::ToValidFileName(" file<name>?") == "file＜name＞？");
+}