Implement an interactive CLI class with tests

Q: Implement an interactive CLI class with tests

This is a Coding & Algorithms interview question from Shopify for Machine Learning Engineer roles. View the full question and solution on PracHub.

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Question

Design and implement a command-line interactive application as a single class using OOP principles. The program should support commands: add <key> <value>, get <key>, delete <key>, list, help, and exit; persist state to a local file; validate and handle invalid input gracefully; log errors; and be easily extensible for new commands. Write comprehensive unit tests that cover happy paths, edge cases (e.g., duplicate keys, missing keys, malformed commands), and error handling. Include a README with local setup instructions, how to run tests, and a GitHub workflow (e.g., Actions) that runs the test suite on push. Explain your class design (state, methods, dependency boundaries), how you would refactor to support subcommands/modules, and trade-offs you made under a 60-minute time constraint.

Implement an interactive CLI class with tests

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