feat(tests): enhance eip7825 test coverage for checklist

src/ethereum_test_forks/forks/forks.py

@@ -1457,7 +1457,7 @@ def full_blob_tx_wrapper_version(cls, block_number=0, timestamp=0) -> int | None
 
     @classmethod
     def transaction_gas_limit_cap(cls, block_number: int = 0, timestamp: int = 0) -> int | None:
-        """At Osaka, transaction gas limit is capped at 30 million."""
+        """At Osaka, transaction gas limit is capped at 16 million (2**24)."""
         return 16_777_216
 
     @classmethod

tests/osaka/eip7823_modexp_upper_bounds/test_modexp_upper_bounds.py

@@ -10,13 +10,13 @@
 from ethereum_test_tools.vm.opcode import Opcodes as Op
 
 from ...byzantium.eip198_modexp_precompile.helpers import ModExpInput, ModExpOutput
-from ..eip7825_transaction_gas_limit_cap.test_tx_gas_limit import TX_GAS_LIMIT
 from ..eip7883_modexp_gas_increase.spec import Spec, Spec7883
 
 REFERENCE_SPEC_GIT_PATH = "EIPS/eip-7823.md"
 REFERENCE_SPEC_VERSION = "c8321494fdfbfda52ad46c3515a7ca5dc86b857c"
 
 MAX_LENGTH_BYTES = 1024
+TX_GAS_LIMIT = 2**24
 
 
 @pytest.fixture

tests/osaka/eip7825_transaction_gas_limit_cap/spec.py

@@ -0,0 +1,26 @@
+"""Defines EIP-7825 specification constants and functions."""
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class ReferenceSpec:
+    """Defines the reference spec version and git path."""
+
+    git_path: str
+    version: str
+
+
+# EIP-7825 reference specification
+ref_spec_7825 = ReferenceSpec("EIPS/eip-7825.md", "47cbfed315988c0bd4d10002c110ae402504cd94")
+
+
+@dataclass(frozen=True)
+class Spec:
+    """Constants and helpers for the EIP-7825 Transaction Gas Limit Cap tests."""
+
+    # Gas limit constants
+    tx_gas_limit_cap = 2**24  # 16,777,216
+
+    # Blob transaction constants
+    blob_commitment_version_kzg = 1