🗒️ Description

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Problem

The test_model_copy unit test at line 890 of test_types.py was failing because:

1. The Environment model has a gas_limit field with a default_factory that references EnvironmentDefaults.gas_limit
2. During test execution, pytest plugins modify EnvironmentDefaults.gas_limit globally
3. The original CopyValidateModel.copy() method used model_dump(exclude_unset=True), which excludes fields set via default_factory
4. When recreating the model copy, the default_factory would run again with the new (modified) value, resulting in different gas_limit values between the original and the copy

Solution

Modified the copy() method in packages/testing/src/execution_testing/base_types/pydantic.py to:

1. Use model_dump() without exclude_unset=True to capture all actual field values (including those set via default_factory)
2. Create a new instance with all those values
3. Manually restore the original model_fields_set by setting __pydantic_fields_set__ to preserve which fields were explicitly set vs. set by defaults

This ensures that:

• The actual runtime values are preserved when copying (fixing the bug)
• The model_fields_set is maintained correctly (satisfying the test assertion)
• All other tests continue to pass

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

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