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


int _testmain();

TEST_CASE("main prints name and message on separate lines", "[main-output]") {
    std::ostringstream output;
    std::streambuf* oldCoutBuf = std::cout.rdbuf(output.rdbuf());
    _testmain();
    std::cout.rdbuf(oldCoutBuf);
    std::string result = output.str();
    size_t newlinePos = result.find('\\n');
    REQUIRE(newlinePos != std::string::npos); // There should be at least one newline
    std::string firstLine = result.substr(0, newlinePos);
    std::string secondLine = result.substr(newlinePos + 1);
    REQUIRE(!firstLine.empty()); // First line (name) should not be empty
    REQUIRE(!secondLine.empty()); // Second line (message) should not be empty
    REQUIRE(firstLine != secondLine); // Name and message should be different
}

test.cpp

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