Support mocking for async methods

[sckott]

Right now, mocking is only supported for HttpClient. Support it for if possible

• Async
• AsyncVaried

AsyncVaried is used inside of Async, so should just need to adjust AsyncVaried

[sckott]

see local branch mock-async

It's not clear how to do this.

I can't see a way to mock the mutli curl api, but maybe it can be dumber than that ...

[maelle]

ah, so is this a limit for http testing at the moment?

[sckott]

yes, right now async requests can't be tested with webmockr or vcr

[maelle]

Good to know!

[maelle]

so just as a note, in ropenaq tests that uses async requests got skip_if_offline() :-)