1 files changed, 88 insertions, 0 deletions
diff --git a/tests/SelfTest/IntrospectiveTests/Clara.tests.cpp b/tests/SelfTest/IntrospectiveTests/Clara.tests.cpp
new file mode 100644
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--- /dev/null
+++ b/tests/SelfTest/IntrospectiveTests/Clara.tests.cpp
@@ -0,0 +1,88 @@
+
+//              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_clara.hpp>
+
+
+#include <string>
+
+TEST_CASE("is_unary_function", "[clara][compilation]") {
+    auto unary1 = [](int) {};
+    auto unary2 = [](std::string const&) {};
+    auto const unary3 = [](std::string const&) {};
+    auto unary4 = [](int) { return 42; };
+    void unary5(char);
+    double unary6(long);
+
+    double binary1(long, int);
+    auto binary2 = [](int, char) {};
+    auto nullary1 = []() {};
+    auto nullary2 = []() {return 42;};
+
+    STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary1)>::value);
+    STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary2)>::value);
+    STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary3)>::value);
+    STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary4)>::value);
+    STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary5)>::value);
+    STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary6)>::value);
+
+    STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(binary1)>::value);
+    STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(binary2)>::value);
+    STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(nullary1)>::value);
+    STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(nullary2)>::value);
+    STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<int>::value);
+    STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<std::string const&>::value);
+}
+
+
+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");
+}
+
+TEST_CASE("Clara::Arg does not crash on incomplete input", "[clara][arg][compilation]") {
+    std::string name;
+    auto p = Catch::Clara::Arg(name, "-");
+
+    CHECK(name.empty());
+
+    auto result = p.parse( Catch::Clara::Args{ "UnitTest", "-" } );
+    CHECK( result );
+    CHECK( result.type() == Catch::Clara::Detail::ResultType::Ok );
+    const auto& parsed = result.value();
+    CHECK( parsed.type() == Catch::Clara::ParseResultType::NoMatch );
+    CHECK( parsed.remainingTokens().count() == 2 );
+    CHECK( name.empty() );
+}
+
+TEST_CASE("Clara::Opt supports accept-many lambdas", "[clara][opt]") {
+    using namespace Catch::Clara;
+    std::vector<std::string> res;
+    const auto push_to_res = [&](std::string const& s) {
+        res.push_back(s);
+        return ParserResult::ok( ParseResultType::Matched );
+    };
+
+    SECTION("Parsing fails on multiple options without accept_many") {
+        auto p = Parser() | Opt(push_to_res, "value")["-o"];
+        auto parse_result = p.parse( Args{ "UnitTest", "-o", "aaa", "-o", "bbb" } );
+        CHECK_FALSE(parse_result);
+    }
+    SECTION("Parsing succeeds on multiple options with accept_many") {
+        auto p = Parser() | Opt(accept_many, push_to_res, "value")["-o"];
+        auto parse_result = p.parse( Args{ "UnitTest", "-o", "aaa", "-o", "bbb" } );
+        CHECK(parse_result);
+        CHECK(res == std::vector<std::string>{ "aaa", "bbb" });
+    }
+}