test: adding basic tests for agent.handlePresentation

[curtis-h]

Description:

Discovered we're missing tests for some agent functions.
Added a very simple set of tests to prove high level functionality.

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

Lines	Statements	Branches	Functions
	77.48% (3713/4792)	68.04% (1714/2519)	81.27% (877/1079)

[coveralls]

coverage: 74.029% (+1.4%) from 72.596%
when pulling e5aeaba on test/handlePresentation
into 4f7974d on main.