
#define CATCH_CONFIG_MAIN
#include <catch2/catch.hpp>



#include <sstream>
#include <iostream>

int _testmain();

TEST_CASE("Program prints exactly two lines", "[output]") {
    std::ostringstream output;
    std::streambuf* oldCoutBuf = std::cout.rdbuf(output.rdbuf());
    _testmain();
    std::cout.rdbuf(oldCoutBuf);
    std::string result = output.str();
    std::istringstream iss(result);
    std::string line1, line2, extra;
    std::getline(iss, line1);
    std::getline(iss, line2);
    std::getline(iss, extra);
    // Remove possible trailing carriage return for Windows compatibility
    if (!line1.empty() && line1.back() == '\\r') line1.pop_back();
    if (!line2.empty() && line2.back() == '\\r') line2.pop_back();
    REQUIRE(extra.empty()); // Only two lines should be output
}

TEST_CASE("First line is not empty (should be a name)", "[output]") {
    std::ostringstream output;
    std::streambuf* oldCoutBuf = std::cout.rdbuf(output.rdbuf());
    _testmain();
    std::cout.rdbuf(oldCoutBuf);
    std::string result = output.str();
    std::istringstream iss(result);
    std::string line1;
    std::getline(iss, line1);
    if (!line1.empty() && line1.back() == '\\r') line1.pop_back();
    REQUIRE(!line1.empty());
}

TEST_CASE("Second line is not empty (should be a message)", "[output]") {
    std::ostringstream output;
    std::streambuf* oldCoutBuf = std::cout.rdbuf(output.rdbuf());
    _testmain();
    std::cout.rdbuf(oldCoutBuf);
    std::string result = output.str();
    std::istringstream iss(result);
    std::string line1, line2;
    std::getline(iss, line1);
    std::getline(iss, line2);
    if (!line2.empty() && line2.back() == '\\r') line2.pop_back();
    REQUIRE(!line2.empty());
}

TEST_CASE("Each line ends with a newline (std::endl)", "[output]") {
    std::ostringstream output;
    std::streambuf* oldCoutBuf = std::cout.rdbuf(output.rdbuf());
    _testmain();
    std::cout.rdbuf(oldCoutBuf);
    std::string result = output.str();
    // There should be at least two newlines: one after each line
    size_t newlineCount = std::count(result.begin(), result.end(), '\\n');
    REQUIRE(newlineCount >= 2);
}

TEST_CASE("Program uses std::cout for output", "[output]") {
    // This is a meta-test: if output appears, std::cout was likely used.
    std::ostringstream output;
    std::streambuf* oldCoutBuf = std::cout.rdbuf(output.rdbuf());
    _testmain();
    std::cout.rdbuf(oldCoutBuf);
    std::string result = output.str();
    REQUIRE(!result.empty());
}

test_main.cpp

A beginner-friendly course introducing the core concepts of C++ programming, featuring hands-on practice chapters to reinforce learning.

Explore the basics of C++ syntax, structure, and the process of writing your first program.

Delve into variable declaration, initialization, and the fundamental data types in C++.

Master the basics of user input and formatted output in C++.

Explore decision-making and repetition in C++ using conditionals and loops.

Learn how to organize code into reusable functions and understand variable scope.

Challenge: Variable Practice

Solution