Add testing

[brownierin]

Description

Snow uses pytest to run our unit tests. The unit tests currently contain slack-specific information and thus haven't been released. We need to clean up the tests and add them to the open source release.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.