Arg::parse accepts plain Args as argument

tests/SelfTest/IntrospectiveTests/Clara.tests.cpp

@@ -0,0 +1,22 @@
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.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_clara.hpp>
+
+
+#include <string>
+
+TEST_CASE("Clara::Arg supports single-arg parse the way Opt does", "[clara][arg][compilation]") {
+    std::string name;
+    auto p = Catch::Clara::Arg(name, "just one arg");
+    
+    CHECK(name.empty());
+    
+    p.parse( Catch::Clara::Args{ "UnitTest", "foo" } );
+    REQUIRE(name == "foo");
+}