vendor Catch2 and ETL

contrib/fsfw_contrib/Catch2-3.7.1/tests/SelfTest/IntrospectiveTests/Stream.tests.cpp

@@ -0,0 +1,32 @@
+
+//              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
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <catch2/internal/catch_istream.hpp>
+
+TEST_CASE( "Cout stream properly declares it writes to stdout", "[streams]" ) {
+    REQUIRE( Catch::makeStream( "-" )->isConsole() );
+}
+
+TEST_CASE( "Empty stream name opens cout stream", "[streams]" ) {
+    REQUIRE( Catch::makeStream( "" )->isConsole() );
+}
+
+TEST_CASE( "stdout and stderr streams have %-starting name", "[streams]" ) {
+    REQUIRE( Catch::makeStream( "%stderr" )->isConsole() );
+    REQUIRE( Catch::makeStream( "%stdout" )->isConsole() );
+}
+
+TEST_CASE( "request an unknown %-starting stream fails", "[streams]" ) {
+    REQUIRE_THROWS( Catch::makeStream( "%somestream" ) );
+}
+
+TEST_CASE( "makeStream recognizes %debug stream name", "[streams]" ) {
+    REQUIRE_NOTHROW( Catch::makeStream( "%debug" ) );
+}