py-evm-issue-1466: Added test cases for EIP170

Author: junning-tong

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  # 2**14 + 2**13

tests/core/vm/fixtures/spurious_dragon_computation_test_code_size_limitation.json

@@ -0,0 +1,93 @@
+import json
+import os
+import pytest
+
+from eth_utils import (
+    to_canonical_address,
+    decode_hex,
+)
+
+from eth.vm.message import (
+    Message,
+)
+from eth.vm.forks.spurious_dragon.computation import (
+    SpuriousDragonComputation,
+)
+from eth.vm.forks.spurious_dragon.constants import (
+    EIP170_CODE_SIZE_LIMIT,
+)
+from eth.vm.transaction_context import (
+    BaseTransactionContext,
+)
+
+CANONICAL_ADDRESS_A = to_canonical_address("0x0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6")
+CANONICAL_ADDRESS_B = to_canonical_address("0xcd1722f3947def4cf144679da39c4c32bdc35681")
+
+
+def contract_code_json():
+    filepath = os.path.join(os.path.dirname(__file__),
+                            'fixtures/spurious_dragon_computation_test_code_size_limitation.json')
+    with open(filepath) as f:
+        return json.load(f)
+
+
+@pytest.fixture
+def state(chain_with_block_validation):
+    state = chain_with_block_validation.get_vm().state
+    state.set_balance(CANONICAL_ADDRESS_A, 1000)
+    return state
+
+
+@pytest.fixture
+def transaction_context():
+    tx_context = BaseTransactionContext(
+        gas_price=0,
+        origin=CANONICAL_ADDRESS_A,
+    )
+    return tx_context
+
+
+def _create_message(code):
+    message = Message(
+        to=CANONICAL_ADDRESS_B,
+        sender=CANONICAL_ADDRESS_A,
+        value=0,
+        data=b'',
+        code=code,
+        gas=5000000,
+    )
+    return message
+
+
+@pytest.mark.parametrize(
+    'message, code_size, is_error',
+    (
+        (
+            # CODE_SIZE == 24575
+            _create_message(decode_hex(contract_code_json()['code_1'])),
+            EIP170_CODE_SIZE_LIMIT - 1,
+            False,
+        ),
+        (
+            # CODE_SIZE == 24576
+            _create_message(decode_hex(contract_code_json()['code_2'])),
+            0,
+            True,
+        ),
+        (
+            # CODE_SIZE == 24577
+            _create_message(decode_hex(contract_code_json()['code_3'])),
+            0,
+            True,
+        )
+    )
+)
+def test_code_size_limit_eip_170(state, message, transaction_context, code_size, is_error):
+    computation = SpuriousDragonComputation(
+        state=state,
+        message=message,
+        transaction_context=transaction_context,
+    ).apply_create_message(state, message, transaction_context)
+
+    assert len(computation.output) == code_size
+    assert computation.is_error == is_error