Function Factorial

examples/020-TestCase-2.cpp:15–18

#include <catch2/catch_test_macros.hpp>

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

TEST_CASE( "2: Factorial of 0 is 1 (fail)", "[multi-file:2]" ) {
    REQUIRE( Factorial(0) == 1 );