Try uploading in-development versions of v3 as testing packages

.conan/test_package/CMakeLists.txt

@@ -7,5 +7,5 @@ conan_basic_setup(TARGETS)
 find_package(Catch2 REQUIRED CONFIG)
 
 add_executable(${PROJECT_NAME} test_package.cpp)
-target_link_libraries(${PROJECT_NAME} CONAN_PKG::Catch2)
+target_link_libraries(${PROJECT_NAME} CONAN_PKG::Catch2Main)
 set_target_properties(${PROJECT_NAME} PROPERTIES CXX_STANDARD 14)

.conan/test_package/test_package.cpp

@@ -1,6 +1,4 @@
-#define CATCH_CONFIG_MAIN
-
-#include <catch2/catch.hpp>
+#include <catch2/catch_test_macros.hpp>
 
 int Factorial( int number ) {
     return number <= 1 ? 1 : Factorial( number - 1 ) * number;