fix(fw): witness in fixtures from t8n output result.

src/ethereum_test_fixtures/blockchain.py

@@ -423,7 +423,7 @@ def from_witness(cls, w: Witness) -> "FixtureWitness":
         """
         Returns a FixtureWitness from a Witness.
         """
-        return cls(**w.model_dump(exclude_none=False))
+        return cls(**w.model_dump())
 
 
 class FixtureBlockBase(CamelModel):

src/ethereum_test_types/verkle/types.py

@@ -2,9 +2,10 @@
 Useful Verkle types for generating Ethereum tests.
 """
 
-from typing import Dict, List
+from typing import Any, Dict, List
 
 from pydantic import Field, RootModel, field_validator
+from pydantic.functional_serializers import model_serializer
 
 from ethereum_test_base_types import CamelModel, HexNumber, PaddedFixedSizeBytes
 
@@ -74,8 +75,20 @@ class SuffixStateDiff(CamelModel):
     """
 
     suffix: int
-    current_value: Hash | None = Field(default_factory=None)
-    new_value: Hash | None = Field(default_factory=None)
+    current_value: Hash | None
+    new_value: Hash | None
+
+    @model_serializer(mode="wrap")
+    def custom_serializer(self, handler) -> Dict[str, Any]:
+        """
+        Custom serializer to include None (null) values for current/new value.
+        """
+        output = handler(self)
+        if self.current_value is None:
+            output["currentValue"] = None
+        if self.new_value is None:
+            output["newValue"] = None
+        return output
 
 
 class StemStateDiff(CamelModel):
@@ -86,7 +99,7 @@ class StemStateDiff(CamelModel):
     Includes a list of differences for its suffixes.
     """
 
-    stem: Hash
+    stem: Stem
     suffix_diffs: List[SuffixStateDiff]
 
 

src/evm_transition_tool/transition_tool.py

@@ -320,7 +320,6 @@ def _evaluate_filesystem(
             args.extend(
                 ["--output.vkt", output_paths["vkt"], "--output.witness", output_paths["witness"]]
             )
-            print(output_paths)
             if t8n_data.vkt is not None:
                 args.extend(["--input.vkt", input_paths["vkt"]])
 
@@ -379,7 +378,6 @@ def _evaluate_filesystem(
             with open(file_path, "r+") as file:
                 output_contents[key] = json.load(file)
         output = TransitionToolOutput(**output_contents)
-        print(output)
         if self.trace:
             self.collect_traces(output.result.receipts, temp_dir, debug_output_path)