From 7c541a0fba24d064dd100665e9831a3c76d4b16d Mon Sep 17 00:00:00 2001
From: macong-cdc <cong.ma@crypto.com>
Date: Mon, 18 Jul 2022 15:54:26 +0800
Subject: [PATCH] test gas refund when contract tx is reverted

---
 integration_tests/test_basic.py | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/integration_tests/test_basic.py b/integration_tests/test_basic.py
index b50df7d6af..1f2e4de20e 100644
--- a/integration_tests/test_basic.py
+++ b/integration_tests/test_basic.py
@@ -414,6 +414,34 @@ def test_exception(cluster):
     assert 5 * (10**18) == contract.caller.query()
 
 
+def test_refund_unused_gas_when_contract_tx_reverted(cluster):
+    """
+    Call a smart contract method that reverts with very high gas limit
+
+    Call tx receipt should be status 0 (fail)
+    Fee is gasUsed * effectiveGasPrice
+    """
+    w3 = cluster.w3
+    contract = deploy_contract(w3, CONTRACTS["TestRevert"])
+    more_than_enough_gas = 1000000
+
+    balance_bef = w3.eth.get_balance(ADDRS["community"])
+    receipt = send_transaction(
+        w3,
+        contract.functions.transfer(5 * (10**18) - 1).buildTransaction(
+            {"gas": more_than_enough_gas}
+        ),
+        key=KEYS["community"],
+    )
+    balance_aft = w3.eth.get_balance(ADDRS["community"])
+
+    assert receipt["status"] == 0, "should be a failed tx"
+    assert receipt["gasUsed"] != more_than_enough_gas
+    assert (
+        balance_bef - balance_aft == receipt["gasUsed"] * receipt["effectiveGasPrice"]
+    )
+
+
 def test_message_call(cronos):
     "stress test the evm by doing message calls as much as possible"
     w3 = cronos.w3