adjust test args

Author: vinniefalco

source/test/SingleFile.hpp

@@ -34,6 +34,8 @@ class SingleFile
         std::vector<std::string> cmds;
         cmds.emplace_back("clang");
         cmds.emplace_back("-std=c++20");
+        cmds.emplace_back("-pedantic-errors");
+        cmds.emplace_back("-Werror");
         cmds.emplace_back(file);
         cc_.emplace_back(
             dir,