test_package.cpp

#define CATCH_CONFIG_MAIN

#include <catch2/catch.hpp>

int Factorial( int number ) {
    return number <= 1 ? 1 : Factorial( number - 1 ) * number;
}

TEST_CASE( "Factorial Tests", "[single-file]" ) {
    REQUIRE( Factorial(0) == 1 );
    REQUIRE( Factorial(1) == 1 );
    REQUIRE( Factorial(2) == 2 );
    REQUIRE( Factorial(3) == 6 );
    REQUIRE( Factorial(10) == 3628800 );
}