TAP for Perl 6

[Michael G Schwern]

Ovid wrote:
> Currently that should output something like:
> 
>   not ok 1 - Should be true
>   # Expected a true value
>   # have: 0
> 
> The first line of the diagnostic can be overridden (and sometimes is) and I'm not trying to conform to the "proper" YAML/JSON spec because Perl 6 is missing a few keys things and we haven't nailed this down.  However, I still want to figure out a few things better.  We don't have normal have/want lines for boolean assertions, so what should they be?  (Also, you can specify 'verbose' mode for tests and you'll get diagnostics for every test, not just failing).

ok() having a diagnostic isn't so handy in Perl 5 because there's only a
handful of false values.  That you got '' as opposed to 0 or undef isn't
terribly useful.

In Perl 6, since truthiness is detached from value, it is useful.  For example...

    ok system "some_program";

Might produce...

    not ok 1
    # Expected a true value
    # have: 1

It's useful to know that system() returned 1 but false.


> I think we need a clean way of specifying how the comparison is made.  "1.0" == "1.00" but it does not eq "1.00".  How should I render that?

# Failed $have eq $want
# have: "1.00"
# want: "1.0"


-- 
"Clutter and overload are not an attribute of information,
 they are failures of design"
    -- Edward Tufte