Hmmm, while I think it's definitely a useful feature, if I was actually going to add it to Test::Deep, I think I would do it differently. Something like your original suggestion:
$expect {
key => "value",
opt_key("key2") => "value2",
};
And modify the Test::Deep::Hash to recognise this. I don't really have time right now but if you're interested, I would do something like:
sub opt_key {
my $key = shift;
return Test::Deep::OptionalKey->new($key);
}
and modify the code in descend() in Test::Deep::HashKeysOnly to detect Test::Deep::OptionalKey objects and not add them to @missing then modify Test::Deep::HashElements to handle OptionalKey correctly too.
It's not a terribly big job, I just don't have time to do it and write the tests and the docs.
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