Added Tests for default values being null

[SaisakthiM]

Description

This PR adds a test for default values being out of range and being null as a regression test

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Test

❯ pytest codegen/opentelemetry-codegen-json/tests/test_default_values.py -v
=============================================================================== test session starts ================================================================================
platform linux -- Python 3.14.7, pytest-9.0.3, pluggy-1.6.0 -- /home/saisakthi/Coding-Project/General Programming Skills/Git/opentelemetry-python/.venv/bin/python
cachedir: .pytest_cache
rootdir: /home/saisakthi/Coding-Project/General Programming Skills/Git/opentelemetry-python
configfile: pyproject.toml
plugins: platformdirs-4.13.0
collected 31 items                                                                                                                                                                 

codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[1-0.0] PASSED                                                            [  3%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[2-0.0] PASSED                                                            [  6%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[3-0] PASSED                                                              [  9%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[13-0] PASSED                                                             [ 12%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[18-0] PASSED                                                             [ 16%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[8-False] PASSED                                                          [ 19%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[9-""] PASSED                                                             [ 22%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_known_types[12-b""] PASSED                                                           [ 25%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_valid_types_without_default[10] PASSED                                               [ 29%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_valid_types_without_default[11] PASSED                                               [ 32%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_valid_types_without_default[14] PASSED                                               [ 35%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_out_of_range[0] PASSED                                                               [ 38%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_out_of_range[-1] PASSED                                                              [ 41%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_out_of_range[999] PASSED                                                             [ 45%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_get_default_value_out_of_range[2147483648] PASSED                                                      [ 48%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_every_mapped_type_has_a_default PASSED                                                                 [ 51%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[1] PASSED                                                              [ 54%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[2] PASSED                                                              [ 58%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[3] PASSED                                                              [ 61%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[4] PASSED                                                              [ 64%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[5] PASSED                                                              [ 67%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[6] PASSED                                                              [ 70%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[7] PASSED                                                              [ 74%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[8] PASSED                                                              [ 77%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[9] PASSED                                                              [ 80%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[12] PASSED                                                             [ 83%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[13] PASSED                                                             [ 87%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[15] PASSED                                                             [ 90%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[16] PASSED                                                             [ 93%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[17] PASSED                                                             [ 96%]
codegen/opentelemetry-codegen-json/tests/test_default_values.py::test_default_is_valid_python_literal[18] PASSED                                                             [100%]

================================================================================ 31 passed in 0.45s ================================================================================

Issue and Doubt

Is the get_default_value intentionally defaulted to None, if that's not the case we can raise a Index or a ValueError and change the test
I wanted to raise a issue but i just asked it here

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• [ ] Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: SaisakthiM / name: SaisakthiM (4b73f19)

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