xo-alloc2: + utest harness for catch2

accept additional commandline arguments

xo-alloc2/utest/TestUtil.cpp

@@ -0,0 +1,24 @@
+/** @file TestUtil.cpp
+ *
+ *  @author Roland Conybeare, May 2026
+ **/
+
+#include "TestUtil.hpp"
+#include <catch2/catch.hpp>
+
+namespace xo {
+    UtestConfig *
+    UtestConfig::instance() {
+        static UtestConfig s_instance;
+
+        return &s_instance;
+    };
+
+    scope
+    Utest::ut_scope() {
+        return scope(XO_DEBUG(UtestConfig::instance()->debug_flag()),
+                     xtag("name", Catch::getResultCapture().getCurrentTestName()));
+    }
+}
+
+/* end TestUtil.cpp */