diff --git a/test/ORMP.m.sol b/test/ORMP.m.sol
new file mode 100644
index 0000000..5b948a2
--- /dev/null
+++ b/test/ORMP.m.sol
@@ -0,0 +1,64 @@
+// This file is part of Darwinia.
+// Copyright (C) 2018-2023 Darwinia Network
+// SPDX-License-Identifier: GPL-3.0
+//
+// Darwinia is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Darwinia is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Darwinia. If not, see <https://www.gnu.org/licenses/>.
+
+pragma solidity 0.8.17;
+
+import "../src/ORMP.sol";
+import "../src/Verifier.sol";
+
+contract ORMPMock is Verifier {
+    ORMP ormp;
+    address oracle = 0x0000000000ba03146Cc235509E802873D418a6bc;
+    address immutable self = address(this);
+
+    struct P {
+        Message message;
+        bytes proof;
+    }
+
+    constructor() {
+        ormp = new ORMP(self);
+        ormp.setDefaultConfig(self, self);
+    }
+
+    function build_params() public pure returns (bytes memory) {
+        Message memory message = Message(
+            0x00000000001523057a05d6293C1e5171eE33eE0A,
+            4,
+            46,
+            0x0000000000D2de3e2444926c4577b0A59F1DD8BC,
+            42161,
+            0x0000000000D2de3e2444926c4577b0A59F1DD8BC,
+            1919604,
+            hex"394d1bca000000000000000000000000912d7601569cbc2df8a7f0aae50bfd18e8c64d05000000000000000000000000912d7601569cbc2df8a7f0aae50bfd18e8c64d05000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000090496238435591669360000000000000000000000000000000000000000000000"
+        );
+        bytes memory proof =
+            hex"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";
+        P memory p = P(message, proof);
+        return abi.encode(p);
+    }
+
+    function dryrun_recv(bytes memory input) public {
+        IVerifier(oracle).merkleRoot(46, 0);
+        P memory p = abi.decode(input, (P));
+        ormp.recv(p.message, p.proof);
+    }
+
+    function merkleRoot(uint256, uint256) public pure override returns (bytes32) {
+        return 0x3871fec397ebd8b84e7780742d8c7a0649097aa54870c8b7e1d5cb027480aad2;
+    }
+}
diff --git a/test/bench/ORMP.b.sol b/test/bench/ORMP.b.sol
index 693f9ca..3247ab6 100644
--- a/test/bench/ORMP.b.sol
+++ b/test/bench/ORMP.b.sol
@@ -33,25 +33,23 @@ contract ORMPBenchmarkTest is Test {
 
     bytes32 root;
     address immutable self = address(this);
+    uint256 chain1 = Chains.Darwinia;
+    uint256 chain2 = Chains.Arbitrum;
 
     function test_send_fuzz1(bytes calldata encoded) public {
-        perform_send(Chains.Crab, Chains.ArbitrumSepolia, encoded);
+        perform_send(chain1, chain2, encoded);
     }
 
     function test_send_fuzz2(bytes calldata encoded) public {
-        perform_send(Chains.ArbitrumSepolia, Chains.Crab, encoded);
+        perform_send(chain2, chain1, encoded);
     }
 
     function test_recv_fuzz1(bytes calldata encoded) public {
-        uint256 fromChainId = Chains.Crab;
-        uint256 toChainId = Chains.ArbitrumSepolia;
-        test_recv(fromChainId, toChainId, encoded);
+        test_recv(chain1, chain2, encoded);
     }
 
     function test_recv_fuzz2(bytes calldata encoded) public {
-        uint256 fromChainId = Chains.ArbitrumSepolia;
-        uint256 toChainId = Chains.Crab;
-        test_recv(fromChainId, toChainId, encoded);
+        test_recv(chain2, chain1, encoded);
     }
 
     function test_recv(uint256 fromChainId, uint256 toChainId, bytes calldata encoded) internal {