Document Bunny test model

[AndyRae]

Is this the right issue type?

• Yes, I'm planning work for this project team.

Summary

Add documentation to outline Bunny's test strategy, and how this supports changes, particularly for obfuscation.

To make it easier on contributors - we should document how we test Bunny, the data it needs, where to get it, and our approach.

Acceptance Criteria

• Bunny test model is outlined
• Tests pass.

Tasks

• Outline Bunny test model
• Unit tests.
• Documentation.

Confirm creation

• This issue is ready