Update the contract limit size to follow EIP170. Add tests against the size limit.

Author: glaksmono

eth/vm/forks/spurious_dragon/constants.py

@@ -10,4 +10,4 @@
 
 
 # https://github.com/ethereum/EIPs/issues/170
-EIP170_CODE_SIZE_LIMIT = 24577
+EIP170_CODE_SIZE_LIMIT = 24576

tests/core/vm/test_spurious_dragon_computation.py

@@ -0,0 +1,80 @@
+import pytest
+
+from eth_utils import (
+    to_canonical_address,
+)
+
+from eth.vm.message import (
+    Message,
+)
+
+from eth.vm.forks.spurious_dragon.computation import (
+    SpuriousDragonComputation,
+)
+
+from eth.vm.transaction_context import (
+    BaseTransactionContext,
+)
+
+
+NORMALIZED_ADDRESS_A = "0x0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6"
+NORMALIZED_ADDRESS_B = "0xcd1722f3947def4cf144679da39c4c32bdc35681"
+CANONICAL_ADDRESS_A = to_canonical_address("0x0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6")
+CANONICAL_ADDRESS_B = to_canonical_address("0xcd1722f3947def4cf144679da39c4c32bdc35681")
+CONTRACT_CODE_A = b""
+CONTRACT_CODE_B = b""
+CONTRACT_CODE_C = b""
+
+
+@pytest.fixture
+def state(chain_without_block_validation):
+    state = chain_without_block_validation.get_vm().state
+    state.account_db.set_balance(CANONICAL_ADDRESS_A, 1000)
+    return state
+
+
+@pytest.fixture
+def transaction_context():
+    tx_context = BaseTransactionContext(
+        gas_price=1,
+        origin=CANONICAL_ADDRESS_B,
+    )
+    return tx_context
+
+
+@pytest.fixture
+def message():
+    message = Message(
+        to=CANONICAL_ADDRESS_A,
+        sender=CANONICAL_ADDRESS_B,
+        value=100,
+        data=b'',
+        code=CONTRACT_CODE_A, # TODO: Test EIP170_CODE_SIZE_LIMIT here
+        gas=100,
+    )
+    return message
+
+
+@pytest.fixture
+def computation(message, transaction_context, state):
+    computation = SpuriousDragonComputation(
+        state=state,
+        message=message,
+        transaction_context=transaction_context,
+    )
+    return computation
+
+
+def test_code_size_limit(computation):
+    """
+    TODO: CONTRACT_CODE_A size is greater than EIP170_CODE_SIZE_LIMIT
+    """
+
+    """
+    TODO: CONTRACT_CODE_B size is equal to EIP170_CODE_SIZE_LIMIT
+    """
+
+    """
+    TODO: CONTRACT_CODE_C size is lower than EIP170_CODE_SIZE_LIMIT
+    """
+    return