fix: num validators

Author: unnawut

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

@@ -202,7 +202,8 @@ def _build_block_from_spec(
         proposer_index = spec.proposer_index or Uint64(int(spec.slot) % int(state.validators.count))
 
         # Resolve parent root
-        parent_root, parent_state = self._resolve_parent_root(spec, state)
+        parent_state = state.process_slots(spec.slot)
+        parent_root = hash_tree_root(parent_state.latest_block_header)
 
         # Build attestations from spec
         attestations, attestation_signatures = self._build_attestations_from_spec(
@@ -257,34 +258,6 @@ def _build_block_from_spec(
             signature=BlockSignatures(data=signature_list),
         )
 
-    def _resolve_parent_root(
-        self,
-        spec: BlockSpec,
-        state: State,
-    ) -> tuple[Bytes32, State]:
-        """
-        Resolve parent root from BlockSpec.
-
-        For verify_signature tests, we always compute the parent root by
-        advancing the state to the block's slot.
-
-        Parameters
-        ----------
-        spec : BlockSpec
-            The block specification.
-        state : State
-            The anchor state to build against.
-
-        Returns:
-        -------
-        tuple[Bytes32, State]
-            Tuple of (parent_root, state_at_slot).
-        """
-        # Advance state to the block's slot
-        state_at_slot = state.process_slots(spec.slot)
-        parent_root = hash_tree_root(state_at_slot.latest_block_header)
-        return parent_root, state_at_slot
-
     def _build_attestations_from_spec(
         self,
         spec: BlockSpec,

tests/consensus/devnet/verify_signature/test_valid_signatures.py

@@ -34,13 +34,10 @@ def test_proposer_signature(
     ----------------
     This is the most basic signature generation test. It verifies:
     - XMSS key generation works
-    - Block building produces correct structure (TODO: use the spec's block building function)
-    - Proposer attestation is created properly
     - Signature aggregation includes proposer signature
-    - Output serialization works for test vectors
     """
     verify_signature_test(
-        anchor_state=generate_pre_state(num_validators=1),
+        anchor_state=generate_pre_state(num_validators=2),
         block=BlockSpec(
             slot=Slot(1),
             attestations=[],