Feat: idsse-368: publish confirm tests

[mackenzie-grimes-noaa]

Linear Issue

IDSSE-368

Changes

Unit tests for PublishConfirm

Quite complicated to read unfortunately, since I ended up building a functioning mock of every pika object or method that PublishConfirm uses

• No actual RabbitMQ server exists, messages just publish to nowhere
• For example, if PublishConfirm passes some on_connect callback arg to some pika method, my mock method really does accept this as an argument, and invokes the callback right away.

More type hinting for PublishConfirm

Based on pika docs. For example, what args our callback methods expect to be sent by pika

Error handling for publish_message

Raise exception if someone attempts to call publish_message() before any channel has been opened.

• Previously just returned "False" to caller, with no additional detail.
• Now it can be distinguished from case where everything is connected and open, but pika failed for some other reason

[Geary-Layne]

That'a an impressive test module, thanks for taking it on.

[mackenzie-grimes-noaa]

I'll probably want Paul to skim this over (when he is next available for IDSSe work), so he can double-check the minor changes I made to PublishConfirm (mainly _enable_delivery_confirmations()). I could not get some unit tests to pass without changing logic in the module, and it looked like it was an actual bug, but I could be wrong.

But in the meantime, I think these tests are better than nothing.