Problem: rpc fails when basefee overflow int64

- add integration test to reproduce

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Bug Fixes
 
 - [#1336](https://github.com/crypto-org-chain/cronos/pull/1336) Update ethermint to develop to fix feeHistory rpc api.
+- [#]() Fix issues when basefee overflows int64
 
 *February 28, 2024*
 

integration_tests/configs/big_basefee.jsonnet

@@ -0,0 +1,20 @@
+local config = import 'default.jsonnet';
+
+config {
+  'cronos_777-1'+: {
+    genesis+: {
+      app_state+: {
+        feemarket+: {
+          params+: {
+            base_fee_change_denominator: '3',
+            elasticity_multiplier: '4',
+            // 100 cro
+            base_fee: '100000000000000000000',
+            // 1 cro
+            min_gas_price: '1000000000000000000',
+          },
+        },
+      },
+    },
+  },
+}

integration_tests/test_overflow.py

@@ -0,0 +1,36 @@
+from pathlib import Path
+
+import pytest
+
+from .utils import ADDRS, KEYS, send_transaction, setup_custom_cronos, w3_wait_for_block
+
+
+@pytest.fixture(scope="module")
+def cronos(tmp_path_factory):
+    path = tmp_path_factory.mktemp("cronos-mempool")
+    yield from setup_custom_cronos(
+        path, 26300, Path(__file__).parent / "configs/big_basefee.jsonnet"
+    )
+
+
+def test_basefee_overflow(cronos):
+    """
+    test if any json-rpc breaks when base fee overflows int64
+    """
+    w3 = cronos.w3
+    w3_wait_for_block(w3, 1)
+    print(w3.eth.gas_price)
+    tx = {
+        "from": ADDRS["validator"],
+        "to": ADDRS["community"],
+        "value": 1,
+        "gasPrice": w3.eth.gas_price,
+    }
+    tx["gas"] = w3.eth.estimate_gas(tx)
+    receipt = send_transaction(
+        w3,
+        tx,
+        KEYS["community"],
+    )
+    assert receipt.status == 1
+    print("receipt", receipt)