Add tests for numpy hstack and vstack utilities

[dprada]

Summary

• add coverage for numpy hstack conversions and invalid value type handling
• add coverage for numpy vstack conversions, tuple handling, and error path

Testing

• pytest

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https://chatgpt.com/codex/tasks/task_e_68d5c25366688326a6947f58b8081239

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.98%. Comparing base (1dae4d3) to head (24aa386).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

[Copilot]

Pull Request Overview

This PR adds comprehensive test coverage for numpy utility functions hstack and vstack in the pyunitwizard library. The tests validate unit conversions, different value type outputs, and error handling for invalid parameters.

• Adds test coverage for vstack function including numpy array shape validation, tuple value type conversion, and invalid value type error handling
• Adds test coverage for hstack function including unit conversion validation, list value type conversion, and invalid value type error handling

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/utils/numpy/test_vstack.py	New test file with 3 test cases covering vstack functionality including shape validation, tuple conversion, and error handling
tests/utils/numpy/test_hstack.py	New test file with 3 test cases covering hstack functionality including unit conversion, list conversion, and error handling

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