is_refcount() doesn't support check objects

[leonerd]

It appears to be using plain numerical == comparison.

   is_refcount( $cb, Test2::Tools::Compare::validator( sub { $_ > 1 } ),
      '$cb has refcount > 1 captured by followed_by callback' );

causes:

# Failed test '$cb has refcount > 1 captured by followed_by callback'
# at ./t/06followed_by.pl line 29.
#   expected Test2::Compare::Custom=HASH(0x55604b89b340) references, found 2

It'd be handy to support proper use of check objects - especially when combined with Test-More/Test2-Suite#258 - as this would permit

is_refcount( $cb, number_gt(1), '$cb has refcount > 1 captured by followed_by callback' );

[exodist]

The idea here is that you would use is or like for that:

is(get_ref_count($thing), 2);
is(get_ref_count($thing), greater_than(2));

Adding more tools that emulate is() makes little sense. Though under the hood you could wrap the is() code in refcount_is() to support refcount_is($thing, $check) that opens the door for checking that the refcount is a hash or has a deeply nested structure.

[exodist]

We talked in person and decided on this interface:

is($thing, refcnt(5), "refcount is 5");
is($thing, refcnt(5,10), "refcount is between 5 and 10");
is($thing, refcnt($check), "refcount  matches the specified check");

refcnt() is not necessarily the name to use, but similar.

[rabbiveesh]

wouldn't you want to put that refcnt check as a prop inside of a meta check? Meaning

is $thing, meta {
  prop refcount => $check;
}, 'refcount matches the check'