test: Add unit test for pydumpling/pydumpling.py

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Trigger Info

Trigger Type	Triggered By	Source File	Assignment
Manual	cocolato	pydumpling/pydumpling.py	Detail

Summary

This PR introduces a comprehensive suite of unit tests for the pydumpling module, ensuring robust validation of its core functionalities. The tests cover the following key areas:

1. save_dumping Functionality:

   • Verifies correct behavior when provided with explicit exception info and filename.

   • Tests default filename generation when no filename is provided.

   • Ensures fallback to pickle when dill fails during serialization.

   • Confirms proper handling of unexpected errors with appropriate warnings.

2. dump_current_traceback Functionality:

   • Validates dumping of the current traceback to a specified file.

   • Tests default filename generation when no filename is provided.

   • Ensures fallback to pickle when dill fails during serialization.

   • Confirms proper handling of unexpected errors with appropriate warnings.

3. gen_tb_from_frame Functionality:

   • Tests traceback generation from a single frame without a back reference.

   • Validates traceback generation with multiple back-referenced frames, ensuring correct chaining.

   • Confirms the creation of FakeTraceback objects with accurate attributes.

4. Error Handling:

   • Ensures that unexpected errors during dumping or traceback generation trigger RuntimeWarning with appropriate messages.

The tests utilize pytest fixtures for reusable mock objects and employ unittest.mock for controlled testing of file operations and serialization. This ensures the module's reliability and robustness in various scenarios.

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