From de2d7f9a13c827c6346871beb6fe7f9a78bd2b75 Mon Sep 17 00:00:00 2001
From: jinhoonbang <jin.bang@smartcontract.com>
Date: Wed, 14 Feb 2024 12:28:53 -0800
Subject: [PATCH] handle nil gas and gasPrice in backend test client for
 estimateGas

---
 .../evm/client/simulated_backend_client.go    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/core/chains/evm/client/simulated_backend_client.go b/core/chains/evm/client/simulated_backend_client.go
index 3a235b8db40..c49637e7890 100644
--- a/core/chains/evm/client/simulated_backend_client.go
+++ b/core/chains/evm/client/simulated_backend_client.go
@@ -728,6 +728,28 @@ func toCallMsg(params map[string]interface{}) ethereum.CallMsg {
 		callMsg.Value = value
 	}
 
+	switch gas := params["gas"].(type) {
+	case nil:
+		// This parameter is not required so nil is acceptable
+	case uint64:
+		callMsg.Gas = gas
+	case hexutil.Uint64:
+		callMsg.Gas = uint64(gas)
+	default:
+		panic("unexpected type of 'gas' parameter; try hexutil.Uint64, or uint64")
+	}
+
+	switch gasPrice := params["gasPrice"].(type) {
+	case nil:
+		// This parameter is not required so nil is acceptable
+	case *big.Int:
+		callMsg.GasPrice = gasPrice
+	case *hexutil.Big:
+		callMsg.GasPrice = gasPrice.ToInt()
+	default:
+		panic("unexpected type of 'gasPrice' parameter; try *big.Int, or *hexutil.Big")
+	}
+
 	return callMsg
 }