Test Case Generator

Create test cases for this code.

Code: [Paste the function/module here]

Function/Module: [Name and purpose]
Language: [Programming language]
Testing framework: [Jest/Pytest/JUnit/etc]

Please create test cases for:

1. Normal Cases
   - Typical input and expected output
   - Multiple valid scenarios
   - Different input types if applicable

2. Edge Cases
   - Empty inputs
   - Boundary values
   - Maximum/minimum values
   - Special characters (if applicable)

3. Error Cases
   - Invalid input types
   - Out of range values
   - Missing required parameters
   - Null/undefined values

4. Integration Tests
   - Function interactions
   - Dependencies
   - Data flow

5. Performance Tests
   - Large data sets
   - Memory usage
   - Execution time

Test Format:
- Setup/Arrange
- Action/Act
- Assertion/Assert
- Cleanup/Teardown

Include:
- Test description
- Expected outcome
- Assertion details
- Mock objects if needed

Coverage goal: [Aim for 80%+ code coverage]