Use more descriptive error message with no matching router (#1096)

* Use more descriptive error message with no matching router

* Extract constant

solidity/app/contracts/Router.sol

@@ -9,6 +9,9 @@ import {IMessageRecipient} from "@hyperlane-xyz/core/interfaces/IMessageRecipien
 import {IOutbox} from "@hyperlane-xyz/core/interfaces/IOutbox.sol";
 
 abstract contract Router is AbacusConnectionClient, IMessageRecipient {
+    string constant NO_ROUTER_ENROLLED_REVERT_MESSAGE =
+        "No router enrolled for domain. Did you specify the right domain ID?";
+
     // ============ Mutable Storage ============
 
     mapping(uint32 => bytes32) public routers;
@@ -30,7 +33,10 @@ abstract contract Router is AbacusConnectionClient, IMessageRecipient {
      * @param _router The address the message is coming from
      */
     modifier onlyRemoteRouter(uint32 _origin, bytes32 _router) {
-        require(_isRemoteRouter(_origin, _router), "!router");
+        require(
+            _isRemoteRouter(_origin, _router),
+            NO_ROUTER_ENROLLED_REVERT_MESSAGE
+        );
         _;
     }
 
@@ -125,7 +131,7 @@ abstract contract Router is AbacusConnectionClient, IMessageRecipient {
         returns (bytes32 _router)
     {
         _router = routers[_domain];
-        require(_router != bytes32(0), "!router");
+        require(_router != bytes32(0), NO_ROUTER_ENROLLED_REVERT_MESSAGE);
     }
 
     /**

solidity/app/test/router.test.ts

@@ -120,7 +120,9 @@ describe('Router', async () => {
       const sender = utils.addressToBytes32(nonOwner.address);
       await expect(
         inbox.testHandle(origin, sender, recipient, message),
-      ).to.be.revertedWith('!router');
+      ).to.be.revertedWith(
+        `No router enrolled for domain. Did you specify the right domain ID?`,
+      );
     });
 
     it('owner can enroll remote router', async () => {
@@ -128,7 +130,7 @@ describe('Router', async () => {
       const remoteBytes = utils.addressToBytes32(nonOwner.address);
       expect(await router.isRemoteRouter(origin, remoteBytes)).to.equal(false);
       await expect(router.mustHaveRemoteRouter(origin)).to.be.revertedWith(
-        '!router',
+        `No router enrolled for domain. Did you specify the right domain ID?`,
       );
       await router.enrollRemoteRouter(origin, utils.addressToBytes32(remote));
       expect(await router.isRemoteRouter(origin, remoteBytes)).to.equal(true);
@@ -199,7 +201,9 @@ describe('Router', async () => {
         it('reverts when dispatching a message to an unenrolled remote router', async () => {
           await expect(
             dispatchFunction(destinationWithoutRouter),
-          ).to.be.revertedWith('!router');
+          ).to.be.revertedWith(
+            `No router enrolled for domain. Did you specify the right domain ID?`,
+          );
         });
       };