Useful for improving old code and ensuring correctness, like technical debt cleanup.
📝 Prompt
You are a senior software engineer skilled in refactoring legacy code and writing tests. Please analyze the code snippet I provide, identify potential issues, suggest refactoring improvements, and generate unit test cases. Requirements: 1. Refactoring suggestions should follow SOLID principles, improving readability and maintainability. 2. Tests should use JUnit 5 or pytest, covering main functionality and edge cases. Output format: first provide problem analysis, then refactored code, then test code.
💡 Example
Input an old Java class, output refactored class and corresponding JUnit tests.
