support Catch2 v3

- uses Cmake config files for Catch2
- supports both v2 and v3 of Catch2
- Catch2 v3 includes <catch2/catch_all.hpp> instead of <catch2/catch.hpp>
- v3 moves Catch::Contains to Catch::Matchers::ContainsSubstring

see https://github.com/catchorg/Catch2/blob/devel/docs/migrate-v2-to-v3.md

Patch adapted from debian patch catch2_v3.patch
https://salsa.debian.org/science-team/netgen/-/blob/d7ca1c564d90d00ce3d83e0b63c36fbec11cf1ce/debian/patches/catch2_v3.patch

tests/catch/CMakeLists.txt

@@ -3,12 +3,18 @@ if(ENABLE_UNIT_TESTS)
 add_custom_target(unit_tests)
 
 # Build catch_main test object
+find_package(Catch2 REQUIRED)
 include_directories(${CATCH_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/../../libsrc/include ${SPDLOG_INCLUDE_DIR})
 add_library(catch_main STATIC main.cpp)
 set_target_properties(catch_main PROPERTIES CXX_STANDARD 17)
 add_dependencies(unit_tests catch_main)
 add_dependencies(catch_main project_catch)
 
+if (Catch2_VERSION VERSION_GREATER_EQUAL 3)
+  target_compile_options(catch_main PUBLIC -DCATCH2_v3)
+  target_link_libraries(catch_main Catch2::Catch2WithMain)
+endif()
+
 # ensure the test targets are built before testing
 add_test(NAME unit_tests_built COMMAND ${CMAKE_COMMAND} --build . --target unit_tests --config ${CMAKE_BUILD_TYPE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/../.. )
 

tests/catch/archive.cpp

@@ -1,5 +1,9 @@
 
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif
 #include <../core/ngcore.hpp>
 #include <core/register_archive.hpp>
 #include <core/logging.hpp>
@@ -354,7 +358,11 @@ void testArchive(Archive& in, Archive& out)
   SECTION("Not registered")
     {
       SharedPtrAndPtrHolder* p = new NotRegisteredForArchive;
+#ifdef CATCH2_v3
+      REQUIRE_THROWS(out & p, Catch::Matchers::ContainsSubstring("not registered for archive"));
+#else
       REQUIRE_THROWS(out & p, Catch::Contains("not registered for archive"));
+#endif
     }
   SECTION("Non-default constructor")
     {

tests/catch/array.cpp

@@ -1,5 +1,9 @@
 
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif
 #include <core/array.hpp>
 using namespace ngcore;
 using namespace std;

tests/catch/main.cpp

@@ -1,3 +1,7 @@
 #define CATCH_CONFIG_MAIN
 #define DO_NOT_USE_WMAIN
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif

tests/catch/ranges.cpp

@@ -1,5 +1,9 @@
 
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif
 
 #include <core/array.hpp>
 #include <core/ranges.hpp>

tests/catch/symboltable.cpp

@@ -1,5 +1,9 @@
 
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif
 #include <../core/ngcore.hpp>
 using namespace ngcore;
 using namespace std;

tests/catch/utils.cpp

@@ -1,5 +1,9 @@
 
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif
 #include <core/ngcore.hpp>
 using namespace ngcore;
 using namespace std;

tests/catch/version.cpp

@@ -1,5 +1,9 @@
 
+#ifdef CATCH2_v3
+#include "catch2/catch_all.hpp"
+#else
 #include <catch2/catch.hpp>
+#endif
 #include <../core/ngcore.hpp>
 using namespace ngcore;
 using namespace std;