blocks json field didn't use camelCase (#157)

* blocks json field didn't use camelCase

* review fixes

* doc comment

* ruff format

Author: turuslan

packages/testing/src/consensus_testing/test_fixtures/state_transition.py

@@ -94,7 +94,7 @@ def serialize_blocks(self, value: List[BlockSpec]) -> List[dict[str, Any]]:
             The serialized Blocks.
         """
         del value
-        return [block.model_dump(mode="json") for block in self._filled_blocks]
+        return [block.to_json() for block in self._filled_blocks]
 
     @field_serializer("expect_exception", when_used="json")
     def serialize_exception(self, value: type[Exception] | None) -> str | None:

packages/testing/src/consensus_testing/test_types/step_types.py

@@ -108,7 +108,7 @@ def serialize_block(self, value: BlockSpec) -> dict[str, Any]:
                 "Block not filled yet - make_fixture() must be called before serialization. "
                 "This BlockStep should only be serialized after the fixture has been processed."
             )
-        return self._filled_block.model_dump(mode="json")
+        return self._filled_block.to_json()
 
 
 class AttestationStep(BaseForkChoiceStep):

packages/testing/src/framework/test_fixtures/base.py

@@ -62,9 +62,7 @@ def json_dict(self) -> Dict[str, Any]:
 
         Excludes the `info` field and converts snake_case to camelCase.
         """
-        return self.model_dump(
-            mode="json",
-            by_alias=True,
+        return self.to_json(
             exclude_none=True,
             exclude={"info"},
         )

src/lean_spec/types/base.py

@@ -1,6 +1,6 @@
 """Reusable, strict base models for the specification."""
 
-from typing import Any, Self
+from typing import Any, Dict, Self
 
 from pydantic import BaseModel, ConfigDict
 from pydantic.alias_generators import to_camel
@@ -27,6 +27,18 @@ def copy(self: Self, **kwargs: Any) -> Self:
         """Create a copy of the model with the updated fields that are validated."""
         return self.__class__(**(self.model_dump(exclude_unset=True) | kwargs))
 
+    def to_json(self, **kwargs: Any) -> Dict[str, Any]:
+        """Return json encodable representation of this model"""
+        # remove these if user tries to pass them
+        kwargs.pop("mode", None)
+        kwargs.pop("by_alias", None)
+
+        return self.model_dump(
+            mode="json",
+            by_alias=True,
+            **kwargs,
+        )
+
 
 class StrictBaseModel(CamelModel):
     """A strict, immutable pydantic base model."""