test: __doc__ being None when it's not explicitly set

[junrushao]

Additional test of #60

[gemini-code-assist]

Summary of Changes

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This pull request enhances the test suite by adding a new test case to specifically validate the __doc__ attribute's behavior for class members. It ensures that attributes without explicitly defined documentation correctly report None for their __doc__ property, which is crucial for maintaining consistent introspection capabilities within the system. This change is an additional test related to issue #60.

Highlights

• New Test Case: Introduced test_attribute_no_doc to verify the behavior of the __doc__ attribute for class members when documentation is not explicitly provided.
• Docstring Verification: The new test specifically asserts that __doc__ is None for attributes (v_f64, v_str) that lack explicit documentation, while confirming existing documentation for v_i64.

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[gemini-code-assist]

Code Review

This pull request adds a test to verify that the __doc__ attribute of an object field is None when no docstring is provided. The added test is clear and correctly validates the intended behavior. I have one minor suggestion to improve a comment for better clarity.