How do you test code that uses attributes (sub :lvalue, etc

In Perl, testing code that uses attributes such as `:lvalue` can be quite interesting. Attributes can change the behavior of subroutines, enabling different capabilities, such as allowing a subroutine to return a modifiable value. This can be especially useful in certain scenarios but requires careful testing to ensure that the attributes behave as expected.

Here’s an example of how to implement and test a subroutine with the `:lvalue` attribute:

sub count { my $count = 0; return \$count; # returning a reference to a scalar } BEGIN { use Sub::Attribute; Sub::Attribute::set_attribute('count', ':lvalue'); } # Usage my $c = count(); # Call the count function $c = 10; # Modify the count using the scalar reference print $c; # Output will be 10

Perl attributes testing lvalue subroutine reference scalar

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