// create using funct_play2

Contract: blah_test : void -> bool

Purpose: expects nothing, and produces whether blah's selectors
         return what is expected for a newly-constructed blah

bool blah_test()

Examples: blah_test() == true

bool blah_test()
{
    // use blah's constructor(s)

    blah instance(value, );

    // test blah's selectors

    return (instance.get_data_field() == value) &&
           ;
}