Add Unit Tests for Coverage Gaps

[Phillyclause89]

Add Comprehensive Unit Tests for Coverage Gaps

Description:
Review the current test suite and implement additional unit tests to address gaps in test coverage. The goal is to ensure all critical methods and components in the codebase are well-tested, improving the overall reliability and maintainability of the project.

Scope of Work:

1. Critical Methods:
   • heatmaps/__init__.py:
     • __truediv__ method (Code Reference).
     • __add__ method (Code Reference).
2. Broader Coverage:
   • Identify other key components that lack test coverage.
   • Write unit tests for edge cases, error scenarios, and expected behaviors.
3. Testing Framework:
   • Use pytest or unittest to organize and execute tests.
   • Ensure all tests integrate seamlessly with the CI pipeline.

Acceptance Criteria:

• Unit tests cover all identified critical methods and components.
• Tests pass consistently in the CI pipeline.
• Test coverage percentage improves significantly.
• New tests include edge cases, error handling, and boundary conditions.

Additional Notes:

• Ensure test cases are descriptive and easy to maintain.
• Prioritize testing for methods that are frequently used or have a high risk of introducing bugs.