From type/Test

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multi sub can-ok(Mu $var, Str $meth, $desc = "..." )

Marks a test as passed if the given $var can run the method named $meth. The function accepts an optional description. For instance:

class Womble {};
my $womble = Womble.new;
 
# with automatically generated test description 
can-ok $womble, 'collect-rubbish';
#  => An object of type 'Womble' can do the method 'collect-rubbish' 
 
# with human-generated test description 
can-ok $womble, 'collect-rubbish', "Wombles can collect rubbish";
#  => Wombles can collect rubbish