Add basic tests for program output validation

tests/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.11)
+
+project(translation_tests LANGUAGES CXX)
+
+include(FetchContent)
+
+FetchContent_Declare(
+    gtest
+    GIT_REPOSITORY https://github.com/google/googletest.git
+    GIT_TAG v1.15.2
+)
+
+FetchContent_MakeAvailable(gtest)
+
+add_executable(${PROJECT_NAME} translation_tests.cpp)
+
+target_link_libraries(${PROJECT_NAME} PRIVATE gtest gtest_main)
+
+target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_17)
+
+include(GoogleTest)
+gtest_discover_tests(${PROJECT_NAME})

tests/translation_tests.cpp

@@ -0,0 +1,107 @@
+#include <gtest/gtest.h>
+#include <cstdlib>
+#include <sstream>
+#include <string>
+
+std::string executeCommand(const std::string& command, bool captureStderr = false)
+{
+    std::string result;
+    char buffer[128];
+    std::string fullCommand = "../../" + command;
+    if (captureStderr) {
+        fullCommand += " 2>&1";
+    }
+    FILE* pipe = popen(fullCommand.c_str(), "r");
+    if (!pipe) {
+        throw std::runtime_error("Failed to run command.");
+    }
+    while (fgets(buffer, sizeof(buffer), pipe) != nullptr) {
+        result += buffer;
+    }
+    pclose(pipe);
+    return result;
+}
+
+TEST(TranslationTest1, ValidTranslationFromDefault)
+{
+    // english to spanish
+    std::string command = "./lingwi -t es \"hello girl\"";
+    std::string output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "hola chica\n") == 0);
+
+    // english to russian
+    command = "./lingwi -t ru \"the program is being tested here\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "программа тестируется здесь\n") == 0 || 
+        strcasecmp(output.c_str(), "Программа проверяется здесь\n") == 0);
+
+    // english to polish
+    command = "./lingwi -t pl \"hello from the lingwi app\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "witam z aplikacji lingwi\n") == 0 || 
+                strcasecmp(output.c_str(), "witaj z aplikacji lingwi\n") == 0);
+
+    // english to chinese
+    command = "./lingwi -t zh \"chinese is crazy\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "中国人疯了\n") == 0 || strcasecmp(output.c_str(), "中国人很疯狂\n") == 0);
+}
+
+TEST(TranslationTest2, ValidTranslationSourceToTarget)
+{
+    // italian to english
+    std::string command = "./lingwi -s it -t en \"Ciao, la carbonara non si fa con la panna.\"";
+    std::string output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "Hi, carbonara is not made with cream.\n") == 0 || 
+                strcasecmp(output.c_str(), "Hi, carbonara is not done with cream.\n") == 0);
+
+    // german to english
+    command = "./lingwi -s en -t de \"I need forty-two apples.\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "Ich brauche zweiundvierzig Äpfel.\n") == 0);
+
+    // spanish to english
+    command = "./lingwi -s es -t en \"¿Dónde está la biblioteca?\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "Where is the library?\n") == 0);
+}
+
+
+// TEST(TranslationTest3, InvalidSourceLanguage)
+// {
+//     std::string command = "./lingwi -s xx -t en \"yessirski\"";
+//     std::string output = executeCommand(command, true);
+//     EXPECT_TRUE(strcasecmp(output.c_str(), "ERR.: Invalid langcode: xx\n") == 0);
+
+//     command = "./lingwi -s en -t fd \"\"";
+//     output = executeCommand(command, true);
+//     EXPECT_TRUE(strcasecmp(output.c_str(), "ERR.: Invalid langcode: fd\n") == 0);
+
+//     command = "./lingwi -t jajko \"jajka\"";
+//     output = executeCommand(command, true);
+//     EXPECT_TRUE(strcasecmp(output.c_str(), "ERR.: Invalid langcode: jajka") == 0);
+// }
+
+TEST(TranslationTest4, PunctuationHandling)
+{
+    // russian /w punctuation
+    std::string command = "./lingwi -t ru \"She said: 'I'll be there soon.'\"";
+    std::string output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "Она сказала: Я скоро буду там.\n") == 0);
+
+    // multiple punctuation (comma + question mark)
+    command = "./lingwi -t es \"Hello, world! How are you today?\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "¡Hola Mundo! ¿Cómo estás hoy?\n") == 0);
+
+    // spanish exclamation marks + special characters
+    command = "./lingwi -t es \"The cost is $20 & it's worth it!\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "¡El costo es y vale la pena!\n") == 0);
+
+    // spanish question marks
+    command = "./lingwi -t es \"I don't know... what happened?\"";
+    output = executeCommand(command);
+    EXPECT_TRUE(strcasecmp(output.c_str(), "No sé... ¿qué pasó?\n") == 0 || strcasecmp(output.c_str(), "No sé... lo ¿qué pasó?\n") == 0
+     || strcasecmp(output.c_str(), "No sé ... ¿qué pasó?\n") == 0 || strcasecmp(output.c_str(), "No sé ... lo ¿qué pasó?\n") == 0);
+}