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Just noticed this today when fiddling with Curl::Multi in Curb. It seems I can't stub the requests with WebMock.
Otherwise, have been using the curb adapter fine for some time now.
Yes, there is no Curb::Multi support currently, but I'd like to add support for it. I updated the README.
I've never tried to use Curl::Multi so I've never even looked at the code. I'll give it a shot sometime soon.
Closing, since it's not a bug but a missing feature. I have created a 'feature' issue instead https://github.com/bblimke/webmock/issues#issue/67