Add unit test

meson.build

@@ -15,3 +15,7 @@ boost_dep = dependency('boost', version: '>=1.75.0')
 libstriezel_dep = dependency('libstriezel')
 
 subdir('src')
+
+if get_option('build_testing')
+  subdir('test')
+endif

meson.options

@@ -1 +1,2 @@
 option('build_tools', type: 'boolean', value: true, description: 'Enable or disable building the cli tools')
+option('build_testing', type: 'boolean', value: true, description: 'Enable or disable building of automated test programs')

test/meson.build

@@ -0,0 +1 @@
+subdir('unit')

test/unit/main.cpp

@@ -0,0 +1,28 @@
+/* Copyright 2025, Michele "King_DuckZ" Santullo
+ * This file is part of ducktorrent.
+ *
+ * Ducktorrent is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Ducktorrent is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ducktorrent.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <catch2/catch_session.hpp>
+
+int main( int argc, char* argv[] ) {
+  // your setup ...
+
+  int result = Catch::Session().run( argc, argv );
+
+  // your clean-up...
+
+  return result;
+}

test/unit/meson.build

@@ -0,0 +1,12 @@
+catch2_dep = dependency('Catch2', version: '>=3.5.2')
+
+unit_test_prog = executable(meson.project_name() + '_unittest',
+  'main.cpp',
+  'test_parser.cpp',
+  install: false,
+  dependencies: [ducktorrent_dep, catch2_dep],
+)
+
+test ('unit_' + meson.project_name(),
+  unit_test_prog
+)

test/unit/test_parser.cpp

@@ -0,0 +1,115 @@
+/* Copyright 2025, Michele "King_DuckZ" Santullo
+ * This file is part of ducktorrent.
+ *
+ * Ducktorrent is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Ducktorrent is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ducktorrent.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "catch2/catch_test_macros.hpp"
+#include "ducktorrent/parser.hpp"
+
+#define INPUT1_BINARY_BLOB "NjˆwŒ\0XL”óPOˆ_æ5iÄ@\\#ú·<jâ"
+
+namespace {
+constexpr char g_input1_binary_blob[] = INPUT1_BINARY_BLOB;
+constexpr auto g_input1_binary_blob_size = sizeof(g_input1_binary_blob) / sizeof(g_input1_binary_blob[0]) - 1;
+constexpr char g_input1[] = "d8:announce41:http://bttracker.debian.org:6969/ann"
+	"ounce7:comment33:Debian CD from cdimage.debian.org10:created by13:mktorren"
+	"t 1.113:creation datei1742039925e4:infod6:lengthi663748608e4:name32:debian"
+	"-12.10.0-amd64-netinst.iso12:piece lengthi262144e6:pieces40:"
+	INPUT1_BINARY_BLOB "ee";
+constexpr auto g_input1_size = sizeof(g_input1) / sizeof(g_input1[0]) - 1u;
+
+constexpr char g_input2[] = "hello world";
+constexpr auto g_input2_size = sizeof(g_input2) / sizeof(g_input2[0]) - 1u;
+
+constexpr char g_input3[] = "d5:helloe";
+constexpr auto g_input3_size = sizeof(g_input3) / sizeof(g_input3[0]) - 1u;
+
+constexpr char g_input4[] = "d5:hello5:worldee";
+constexpr auto g_input4_size = sizeof(g_input4) / sizeof(g_input4[0]) - 1u;
+
+constexpr char g_input5[] = "d5:hello5:world";
+constexpr auto g_input5_size = sizeof(g_input5) / sizeof(g_input5[0]) - 1u;
+
+constexpr char g_input6[] = "d5:hello100:worlde";
+constexpr auto g_input6_size = sizeof(g_input6) / sizeof(g_input6[0]) - 1u;
+
+template <typename T>
+void check_map_entry (
+	const std::map<duck::TorrentStringType, duck::TorrentValue>& map,
+	duck::TorrentStringType key,
+	T expected,
+	int expected_var_which
+) {
+	REQUIRE(map.contains(key));
+	REQUIRE(map.at(key).get().which() == expected_var_which);
+	const auto& val = boost::get<T>(map.at(key));
+	CHECK(val == expected);
+}
+} //unnamed namespace
+
+TEST_CASE ("Parse valid bencoded test input", "[parse][bencoding]") {
+	using duck::TorrentStringType;
+	using duck::TorrentIntType;
+
+	auto res = duck::parse_torrent(std::string_view{g_input1, g_input1_size});
+	REQUIRE(res.size() == 1);
+
+	const duck::TorrentValue& root = res.front();
+	REQUIRE(root.get().which() == 3);
+
+	const std::map<TorrentStringType, duck::TorrentValue>& main_map =
+		boost::get<
+			boost::spirit::x3::forward_ast< std::map<TorrentStringType, duck::TorrentValue> >
+		>(root).get();
+
+	check_map_entry<TorrentStringType>(main_map, "announce", "http://bttracker.debian.org:6969/announce", 1);
+	check_map_entry<TorrentStringType>(main_map, "comment", "Debian CD from cdimage.debian.org", 1);
+	check_map_entry<TorrentStringType>(main_map, "created by", "mktorrent 1.1", 1);
+	check_map_entry<TorrentIntType>(main_map, "creation date", 1742039925, 0);
+
+	REQUIRE(main_map.contains("info"));
+	REQUIRE(main_map.at("info").get().which() == 3);
+	const std::map<TorrentStringType, duck::TorrentValue>& info_map =
+		boost::get<
+			boost::spirit::x3::forward_ast< std::map<TorrentStringType, duck::TorrentValue> >
+		>(main_map.at("info")).get();
+
+	check_map_entry<TorrentStringType>(info_map, "name", "debian-12.10.0-amd64-netinst.iso", 1);
+	check_map_entry<TorrentIntType>(info_map, "piece length", 262144, 0);
+	check_map_entry<TorrentStringType>(info_map, "pieces", TorrentStringType{g_input1_binary_blob, g_input1_binary_blob_size}, 1);
+}
+
+TEST_CASE ("Parse empty test input", "[parse][bencoding]") {
+	CHECK_THROWS_AS(duck::parse_torrent(""), duck::ParseError);
+}
+
+TEST_CASE ("Parse invalid test input", "[parse][bencoding]") {
+	std::string_view input;
+
+	input = std::string_view{g_input2, g_input2_size};
+	CHECK_THROWS_AS(duck::parse_torrent(input), duck::ParseError);
+
+	input = std::string_view{g_input3, g_input3_size};
+	CHECK_THROWS_AS(duck::parse_torrent(input), duck::ParseError);
+
+	input = std::string_view{g_input4, g_input4_size};
+	CHECK_THROWS_AS(duck::parse_torrent(input), duck::ParseError);
+
+	input = std::string_view{g_input5, g_input5_size};
+	CHECK_THROWS_AS(duck::parse_torrent(input), duck::ParseError);
+
+	input = std::string_view{g_input6, g_input6_size};
+	CHECK_THROWS_AS(duck::parse_torrent(input), duck::ParseError);
+}