integration: add delegate call corner case test (#243)

Closes #235

---------

Signed-off-by: xermicus <cyrill@parity.io>

crates/integration/contracts/DelegateCaller.sol

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.28;
+
+/* runner.json
+{
+    "differential": true,
+    "actions": [
+        {
+            "Instantiate": {
+                "code": {
+                    "Solidity": {
+                        "contract": "DelegateCaller"
+                    }
+                }
+            }
+        },
+        {
+            "Call": {
+                "dest": {
+                    "Instantiated": 0
+                },
+                "data": "e466c6c9"
+            }
+        }
+    ]
+}
+*/
+
+contract DelegateCaller {
+    function delegateNoContract() external returns (bool) {
+        address testAddress = 0x0000000000000000000000000000000000000000;
+        (bool success, ) = testAddress.delegatecall(
+            abi.encodeWithSignature("test()")
+        );
+        return success;
+    }
+}

crates/integration/src/tests.rs

@@ -56,6 +56,7 @@ test_spec!(transfer, "Transfer", "Transfer.sol");
 test_spec!(send, "Send", "Send.sol");
 test_spec!(function_pointer, "FunctionPointer", "FunctionPointer.sol");
 test_spec!(mload, "MLoad", "MLoad.sol");
+test_spec!(delegate_no_contract, "DelegateCaller", "DelegateCaller.sol");
 test_spec!(function_type, "FunctionType", "FunctionType.sol");
 
 fn instantiate(path: &str, contract: &str) -> Vec<SpecsAction> {