Function test_for_error

tests/string_formatter_test.cpp:45–51

template<typename ...Args>
void test_for_error( const char *const format, Args &&... args )
{
    CAPTURE( format );

    const std::string result = throwing_string_format( format, std::forward<Args>( args )... );
    CAPTURE( result );
}
// Test whether raw printf and string_formatter return the same string (using
// old_pattern in both). Test whether the new pattern (if any) yields the same
// output via string_formatter (not used on raw printf).