refactor: add address(0) check for constructors.

contracts/src/L1/L1ScrollMessenger.sol

@@ -27,6 +27,11 @@ import {IMessageDropCallback} from "../libraries/callbacks/IMessageDropCallback.
 /// @dev All deposited Ether (including `WETH` deposited throng `L1WETHGateway`) will locked in
 /// this contract.
 contract L1ScrollMessenger is ScrollMessengerBase, IL1ScrollMessenger {
+    /***********
+     * Errors *
+     ***********/
+    error ErrZeroAddress();
+
     /***********
      * Structs *
      ***********/
@@ -95,6 +100,9 @@ contract L1ScrollMessenger is ScrollMessengerBase, IL1ScrollMessenger {
         address _rollup,
         address _messageQueue
     ) public initializer {
+        if (_counterpart == address(0) || _rollup == address(0) || _messageQueue == address(0)) {
+            revert ErrZeroAddress();
+        }
         ScrollMessengerBase.__ScrollMessengerBase_init(_counterpart, _feeVault);
 
         rollup = _rollup;

contracts/src/L2/L2ScrollMessenger.sol

@@ -24,6 +24,11 @@ import {ScrollMessengerBase} from "../libraries/ScrollMessengerBase.sol";
 /// @dev It should be a predeployed contract on layer 2 and should hold infinite amount
 /// of Ether (Specifically, `uint256(-1)`), which can be initialized in Genesis Block.
 contract L2ScrollMessenger is ScrollMessengerBase, IL2ScrollMessenger {
+    /***********
+     * Errors *
+     ***********/
+    error ErrZeroAddress();
+
     /*************
      * Constants *
      *************/
@@ -49,12 +54,15 @@ contract L2ScrollMessenger is ScrollMessengerBase, IL2ScrollMessenger {
      ***************/
 
     constructor(address _messageQueue) {
+        if (_messageQueue == address(0)) revert ErrZeroAddress();
+
         _disableInitializers();
 
         messageQueue = _messageQueue;
     }
 
     function initialize(address _counterpart) external initializer {
+        if (_counterpart == address(0)) revert ErrZeroAddress();
         ScrollMessengerBase.__ScrollMessengerBase_init(_counterpart, address(0));
     }
 

contracts/src/test/L1GatewayTestBase.t.sol

@@ -82,7 +82,7 @@ abstract contract L1GatewayTestBase is DSTestPlus {
         verifier = new MockRollupVerifier();
 
         // Deploy L2 contracts
-        l2Messenger = new L2ScrollMessenger(address(0));
+        l2Messenger = new L2ScrollMessenger(address(1));
 
         // Initialize L1 contracts
         l1Messenger.initialize(address(l2Messenger), feeVault, address(rollup), address(messageQueue));