This commit introduces a comprehensive suite of unit tests for the
py_debug_graph module, which is responsible for building debug graphs
in Python. The tests cover various scenarios including linked lists,
cycles, scalar values, and the handling of local and global variables
in the debugging context. Additionally, it verifies the behavior of
the debug_graph function and ensures that the builtins.root patch
works as intended. These tests aim to enhance the reliability and
robustness of the debugging functionality.
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