Add unit tests for exposed key email rendering

[gjcthinkst]

Proposed changes

Add unit tests for exposed key email rendering

Types of changes

What types of changes does your code introduce to this repository?

• Added test

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• Lint and unit tests pass locally with my changes (if applicable)
• I have run pre-commit (pre-commit in the repo)
• I have added tests that prove my fix is effective or that my feature works