PR Summary

This pull request introduces several enhancements and bug fixes across different parts of the project:

1. External API Test Update:

   • The external API test in the Jupyter notebooks has been updated to fetch a list of fake users from https://jsonplaceholder.typicode.com/users instead of fetching BTC prices. The test now categorizes users into "Model Owners/Stakeholders", "Model Developers", and "Model Validators" with randomly assigned roles and additional contact information.

2. Date Handling Improvements:

   • The test cases in test_TimeSeriesPredictionWithCI.py and test_TimeSeriesPredictionsPlot.py have been updated to include np.datetime64 as a valid datetime type, improving the robustness of datetime index checks.

3. Error Message Update:

   • The error message in validmind/errors.py for missing R support has been updated to provide clearer instructions for installing rpy2.

4. Utility Enhancements:

   • The validmind/utils.py file has been enhanced to handle np.datetime64 objects and improve the handling of generic objects. A new method default has been added to provide a preview of DataFrame objects, including their type, a preview of the first five rows, and their shape.

5. Test Execution Improvement:

   • The test execution script in tests/test_unit_tests.py now raises an exception with detailed information about failed tests instead of simply exiting, providing better feedback during test failures.

Test Suggestions

• Verify that the updated external API test correctly fetches and processes user data from the new API endpoint.
• Test the categorization logic for users into different roles and ensure randomness in role assignment.
• Check that the datetime index tests correctly identify np.datetime64 objects as valid datetime types.
• Ensure that the error message for missing R support is displayed correctly and provides clear installation instructions.
• Test the serialization of np.datetime64 objects and generic objects in validmind/utils.py.
• Validate the new DataFrame preview functionality in the default method of the utility class.
• Run the test suite to ensure that the new exception handling in tests/test_unit_tests.py provides detailed failure information.