chore: add simple iw3 system test

test/SystemTests/SystemTestsPaths.cpp

@@ -0,0 +1,15 @@
+#include "SystemTestsPaths.h"
+
+#include "OatTestPaths.h"
+
+#include <filesystem>
+
+namespace fs = std::filesystem;
+
+namespace oat::paths
+{
+    std::filesystem::path GetSystemTestsDirectory()
+    {
+        return GetTestDirectory() / "SystemTests";
+    }
+} // namespace oat::paths