Provide fake connection for testing?

[mlh758]

I wrote a basic in-memory fake for the AsyncCommands trait. It's been a nice way to pass this to my functions and make sure they're collecting the correct types and such.

Here is the implementation. Is this something that you would be interested in having as part of the redis-rs library itself? I understand not wanting to take on maintenance for it, but I think it could be helpful for other people writing tests so I thought I'd ask.

[tdyas]

I wrote something similar as well although focused on ConnectionLike. PR here: #465

[mlh758]

My implementation is for ConnectionLike, that's definitely the easiest way to get Commands. On your PR, this is how you can test a pipeline with a mock ConnectionLike implementation.

[mlh758]

Going to close this though, it hasn't gotten any comments from maintainers and your PR is sitting open too.