Add DispatchHook unit test

solidity/contracts/test/DispatchedHook.t.sol

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.13;
+
+import "forge-std/Test.sol";
+import {DispatchedHook} from "../../contracts/hooks/DispatchedHook.sol";
+import {IPostDispatchHook} from "../../contracts/interfaces/hooks/IPostDispatchHook.sol";
+import {StandardHookMetadata} from "../../contracts/hooks/libs/StandardHookMetadata.sol";
+import {Message} from "../../contracts/libs/Message.sol";
+import {TypeCasts} from "../../contracts/libs/TypeCasts.sol";
+
+contract DispatchedHookTest is Test {
+    using Message for bytes;
+    using TypeCasts for address;
+
+    DispatchedHook hook;
+
+    function setUp() public {
+        hook = new DispatchedHook();
+    }
+
+    function testDispatchedHookTest_SetsDispatchedMapping(
+        uint32 _nonce,
+        bytes calldata _messageBody
+    ) public {
+        bytes memory message = Message.formatMessage(
+            0,
+            _nonce,
+            0,
+            address(this).addressToBytes32(),
+            0,
+            address(this).addressToBytes32(),
+            _messageBody
+        );
+        bytes memory metadata = StandardHookMetadata.formatMetadata(
+            0,
+            0,
+            address(0),
+            bytes("")
+        );
+        hook.postDispatch(metadata, message);
+        assertEq(message.id(), hook.dispatched(_nonce));
+    }
+
+    function testDispatchedHookTest_QuotesZero() public view {
+        bytes memory metadata = StandardHookMetadata.formatMetadata(
+            0,
+            0, // gas limit
+            address(0), // refund address
+            bytes("")
+        );
+        assertEq(hook.quoteDispatch(metadata, bytes("")), 0);
+    }
+
+    function testDispatchedHookTest_HookType() public view {
+        assertEq(hook.hookType(), uint8(IPostDispatchHook.Types.DISPATCHED));
+    }
+}