Improve testing

[gwiedeman]

The problem the component solves

Currently, mailbagit only has reliable unit testing for the format parsers. It does this by reading a serialization of the sample data created by the model and comparing that to the built-in data format parsers. The dumpData.py script can be used to create a new serialization,

While this seems robust for the format parsers there is currently no unit tests for other parts of mailbagit, notably the controller, the helpers, or the derivatives.

Relevant part of mailbag spec?

N/A

Type of component

• [x] Core
• [ ] Input
• [ ] Attachments
• [ ] Derivatives conversion
• [ ] Reporting/Exporting
• [ ] GUI
• [ ] Distribution

Expected contribution

• [x] Pull Request
• [ ] Comment with proposed solution

Major challenges or things to keep in mind

Representative test data can be hard to come by but I have been accumulating some examples.