Local testing of pre-signed URLs

[mplough-kobold]

#236 added basic pre-signed URL functionality. It's great not to have to dig into boto3 and do this manually.

According to the Testing code that uses cloudpathlib documentation:

In the cloudpathlib.local module, we provide "Local" classes that use the local filesystem in place of cloud storage. These classes are drop-in replacements for the normal cloud path classes, with the intent that you can use them as mock or monkeypatch substitutes in your tests.

Currently, the monkeypatching with Local classes results in the following error when attempting to test code that generates pre-signed URLs:

NotImplementedError: Cannot generate a presigned URL for a local path.

Would it be possible to add a basic implementation here to fulfill the documented intent?

[pjbull]

Yeah, good point. Happy to take a fix that implements returning a reasonable local URL. We should also add a note to the docs that you can't actually use these URLs, they are just to return something.