diff --git a/tests/it/geth_js.rs b/tests/it/geth_js.rs
index 25c08875..48155ff4 100644
--- a/tests/it/geth_js.rs
+++ b/tests/it/geth_js.rs
@@ -70,3 +70,101 @@ fn test_geth_jstracer_revert() {
     // reverted operation
     assert!(result["error"].as_bool().unwrap());
 }
+
+#[test]
+fn test_geth_jstracer_op_gascost() {
+    /*
+    pragma solidity ^0.8.13;
+
+    contract Foo {
+        event Log(address indexed addr, uint256 value);
+
+        function foo() external {
+            emit Log(msg.sender, 0);
+        }
+
+        function bar() external {
+            emit Log(msg.sender, 0);
+            require(false, "barbarbar");
+        }
+    }
+    */
+
+    let code = hex!("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");
+
+    let (addr, mut evm) = deploy_contract(code.into(), Address::ZERO, SpecId::CANCUN);
+
+    let code = r#"
+{
+  data: [],
+  memoryInstructions: { "MSTORE": "W", "MSTORE8": "B", "MLOAD": "R" },
+  fault: function (_) {},
+  step: function (log) {
+    let op = log.op.toString();
+    let instructions = this.memoryInstructions;
+    if (Object.keys(instructions).includes(op)) {
+      this.data.push({
+        op: instructions[op],
+        depth: log.getDepth(),
+        offset: log.stack.peek(0),
+        gasCost: log.getCost(),
+        memorySize: log.memory.length(),
+      });
+    }
+  },
+  result: function (ctx, _) { return { error: !!ctx.error, data: this.data }; }
+}
+"#;
+
+    // test with normal operation
+    let env = evm.env_with_tx(TxEnv {
+        transact_to: TransactTo::Call(addr),
+        data: hex!("c2985578").into(), // call foo
+        ..Default::default()
+    });
+    let mut insp = JsInspector::new(code.to_string(), serde_json::Value::Null).unwrap();
+    let (res, _) = inspect(&mut evm.db, env.clone(), &mut insp).unwrap();
+    assert!(res.result.is_success());
+
+    let result = insp.json_result(res, &env, &evm.db).unwrap();
+
+    assert!(!result["error"].as_bool().unwrap());
+    assert_eq!(
+        result["data"],
+        serde_json::json!([
+            { "op": "W", "depth": 1, "offset": "64", "gasCost": 12, "memorySize": 0 },
+            { "op": "R", "depth": 1, "offset": "64", "gasCost": 3, "memorySize": 96 },
+            { "op": "W", "depth": 1, "offset": "128", "gasCost": 9, "memorySize": 96 },
+            { "op": "R", "depth": 1, "offset": "64", "gasCost": 3, "memorySize": 160 }
+        ])
+    );
+
+    // test with reverted operation
+    let env = evm.env_with_tx(TxEnv {
+        transact_to: TransactTo::Call(addr),
+        data: hex!("febb0f7e").into(), // call bar
+        ..Default::default()
+    });
+    let mut insp = JsInspector::new(code.to_string(), serde_json::Value::Null).unwrap();
+    let (res, _) = inspect(&mut evm.db, env.clone(), &mut insp).unwrap();
+    assert!(!res.result.is_success());
+
+    let result = insp.json_result(res, &env, &evm.db).unwrap();
+
+    assert!(result["error"].as_bool().unwrap());
+    assert_eq!(
+        result["data"],
+        serde_json::json!([
+            { "op": "W", "depth": 1, "offset": "64", "gasCost": 12, "memorySize": 0 },
+            { "op": "R", "depth": 1, "offset": "64", "gasCost": 3, "memorySize": 96 },
+            { "op": "W", "depth": 1, "offset": "128", "gasCost": 9, "memorySize": 96 },
+            { "op": "R", "depth": 1, "offset": "64", "gasCost": 3, "memorySize": 160 },
+            { "op": "R", "depth": 1, "offset": "64", "gasCost": 3, "memorySize": 160 },
+            { "op": "W", "depth": 1, "offset": "128", "gasCost": 3, "memorySize": 160 },
+            { "op": "W", "depth": 1, "offset": "132", "gasCost": 6, "memorySize": 160 },
+            { "op": "W", "depth": 1, "offset": "164", "gasCost": 6, "memorySize": 192 },
+            { "op": "W", "depth": 1, "offset": "196", "gasCost": 6, "memorySize": 224 },
+            { "op": "R", "depth": 1, "offset": "64", "gasCost": 3, "memorySize": 256 }
+        ])
+    );
+}