Implement a simple service with tests

Q: Implement a simple service with tests

This question evaluates implementation skills including clear control flow, robust input validation, requirement clarification, and unit test design for a small service class.

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Question

You're given a short written specification for a small service class (no external dependencies). Implement the class using clear control flow (primarily if/else) and robust input validation. The exercise has three parts: (

implement the core logic; (
extend it with an additional requirement based on clarified assumptions; (
write unit tests that cover happy paths, edge cases, and error handling for both parts. State all assumptions explicitly and provide method signatures and representative test cases.

Implement a simple service with tests

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