Add test scaffolding for catch_discover_tests

tests/CMakeLists.txt

@@ -622,6 +622,18 @@ if (CATCH_ENABLE_CONFIGURE_TESTS)
     endforeach()
 endif()
 
+if (CATCH_ENABLE_CMAKE_HELPER_TESTS)
+    add_test(NAME "CMakeHelper::DiscoverTests"
+      COMMAND
+        "${PYTHON_EXECUTABLE}" "${CMAKE_CURRENT_LIST_DIR}/TestScripts/DiscoverTests/VerifyRegistration.py" "${CATCH_DIR}" "${CMAKE_CURRENT_BINARY_DIR}"
+    )
+    set_tests_properties("CMakeHelper::DiscoverTests"
+      PROPERTIES
+        COST 240
+        LABELS "uses-python"
+    )
+endif()
+
 foreach (reporterName # "Automake" - the simple .trs format does not support any kind of comments/metadata
                       "compact"
                       "console"