externals: Add catch2 v3.2.1

Merge commit '6879e5bb1c' as 'externals/catch'

externals/catch/tests/TestScripts/testConfigureDefaultReporter.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+#              Copyright Catch2 Authors
+# Distributed under the Boost Software License, Version 1.0.
+#   (See accompanying file LICENSE.txt or copy at
+#        https://www.boost.org/LICENSE_1_0.txt)
+
+# SPDX-License-Identifier: BSL-1.0
+
+from ConfigureTestsCommon import configure_and_build, run_and_return_output
+
+import os
+import re
+import sys
+
+"""
+Tests the CMake configure option for CATCH_CONFIG_DEFAULT_REPORTER
+
+Requires 2 arguments, path folder where the Catch2's main CMakeLists.txt
+exists, and path to where the output files should be stored.
+"""
+
+if len(sys.argv) != 3:
+    print('Wrong number of arguments: {}'.format(len(sys.argv)))
+    print('Usage: {} catch2-top-level-dir base-build-output-dir'.format(sys.argv[0]))
+    exit(1)
+
+catch2_source_path = os.path.abspath(sys.argv[1])
+build_dir_path = os.path.join(os.path.abspath(sys.argv[2]), 'CMakeConfigTests', 'DefaultReporter')
+
+configure_and_build(catch2_source_path,
+                    build_dir_path,
+                    [("CATCH_CONFIG_DEFAULT_REPORTER", "xml")])
+
+stdout, _ = run_and_return_output(os.path.join(build_dir_path, 'tests'), 'SelfTest', ['[approx][custom]'])
+
+xml_tag = '</Catch2TestRun>'
+if xml_tag not in stdout:
+    print("Could not find '{}' in the stdout".format(xml_tag))
+    print('stdout: "{}"'.format(stdout))
+    exit(2)