And also a little macro for the test sets.

include/fuc2/testing.hpp

@@ -4,9 +4,13 @@
 #include <fmt/core.h>
 #include <functional>
 
-namespace fuc2 {
+// macro to help adding tests
 #define TEST(N) {#N, N}
 
+// macro to help with the main.cpp
+#define TEST_SET(N) namespace N { extern fuc2::Set TESTS; }
+
+namespace fuc2 {
   using Func = std::function<void()>;
   using Case = std::pair<std::string, Func>;
 
@@ -52,6 +56,4 @@ namespace fuc2 {
 
   void BLOWS_UP(std::function<void()> cb, const std::string &message,
       const std::source_location location = std::source_location::current());
-
-  int run(const Set& test_set);
 }

tests/main.cpp

@@ -2,13 +2,16 @@
 
 // you can also place these into a .hpp you include if
 // they're too numerous to manage
+
+// this is how you do it directly
 namespace sample1 {
   extern fuc2::Set TESTS;
 }
 
-namespace sample_failing {
-  extern fuc2::Set TESTS;
-}
+// this macro jsut does the above for you
+TEST_SET(sample_failing);
+
+using namespace fuc2;
 
 int main(int argc, char* argv[]) {
   run(sample1::TESTS);