macOS Remote testing/debugging, over distributed computing?

Hi,
I am looking for some other Mac's to test my dashboard widget on.
Apparently, it works on my macbook pro, but doesn;t on some other MacBook Pro's.
Does there exist such a service, that over remote connection, they provide you access to the remote computer, which would have MacOSX, and I could install and debug my widget?

Any other ideas would be helpful as well.