feat(tests): Zero gasprice transaction vs account touch

Author: pdobacz

tests/frontier/touch/__init__.py

@@ -0,0 +1 @@
+"""Test for account touching behavior introduced in Frontier."""

tests/frontier/touch/test_touch.py

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+"""test account touch behavior."""
+
+import pytest
+from execution_testing import (
+    Account,
+    Alloc,
+    Environment,
+    Op,
+    StateTestFiller,
+    Transaction,
+)
+
+
+@pytest.mark.valid_from("Frontier")
+@pytest.mark.valid_until("Berlin")
+def test_zero_gas_price_and_touching(
+    state_test: StateTestFiller,
+    pre: Alloc,
+) -> None:
+    """
+    Test sending a zero gasprice transaction in early forks respects
+    account touching rules.
+    """
+    sender = pre.fund_eoa()
+    value = 0x01
+
+    contract = pre.deploy_contract(
+        code=(Op.SSTORE(0, value) + Op.STOP),
+    )
+
+    tx = Transaction(
+        gas_limit=500_000,
+        to=contract,
+        gas_price=0,
+        sender=sender,
+        protected=False,
+    )
+
+    state_test(
+        env=Environment(),
+        pre=pre,
+        tx=tx,
+        post={contract: Account(storage={0: value})},
+    )