Audit preparedness: implement unit tests

[michaeljklein]

Problem

Given list of unit tests from: https://github.com/noir-lang/noir/issues/5361 Implement those unit tests.

Happy Case

Implement unit tests for all key cases in the omnibus issue: https://github.com/noir-lang/noir/issues/5173

Project Impact

None

Impact Context

No response

Workaround

None

Workaround Description

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Additional Context

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