Now off catch2 and on my own testing fuc2.

tests/guecs.cpp

@@ -1,10 +1,20 @@
-#include <catch2/catch_test_macros.hpp>
 #include <fmt/core.h>
 #include "guecs/ui.hpp"
 #include <fmt/xchar.h>
+#include <fuc2/testing.hpp>
 
 using namespace guecs;
+using namespace fuc2;
 
-TEST_CASE("prototype one gui", "[ecs-gui]") {
-  // accidentally gutted, will recover later
+namespace guecs_tests {
+  void test_prototype() {
+    // accidentally gutted, will recover later
+  }
+
+  fuc2::Set TESTS{
+    .name="GUECS tests (empty!)",
+    .tests={
+      {"test_prototype", test_prototype},
+    }
+  };
 }