From 0826c12c23f69c19b234f7247df565e124e449c1 Mon Sep 17 00:00:00 2001
From: saucepoint <saucepoint@protonmail.com>
Date: Sat, 3 Aug 2024 22:15:52 -0400
Subject: [PATCH] test to validate assembly

---
 test/EIP712.t.sol | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 test/EIP712.t.sol

diff --git a/test/EIP712.t.sol b/test/EIP712.t.sol
new file mode 100644
index 00000000..badf6c9c
--- /dev/null
+++ b/test/EIP712.t.sol
@@ -0,0 +1,47 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "forge-std/Test.sol";
+
+import {EIP712} from "../src/base/EIP712.sol";
+
+contract EIP712Test is EIP712, Test {
+    constructor() EIP712("EIP712Test") {}
+
+    function setUp() public {}
+
+    function test_domainSeparator() public view {
+        assertEq(
+            DOMAIN_SEPARATOR(),
+            keccak256(
+                abi.encode(
+                    keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)"),
+                    keccak256(bytes("EIP712Test")),
+                    block.chainid,
+                    address(this)
+                )
+            )
+        );
+    }
+
+    function test_hashTypedData() public view {
+        bytes32 dataHash = keccak256(abi.encodePacked("data"));
+        assertEq(_hashTypedData(dataHash), keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR(), dataHash)));
+    }
+
+    function test_rebuildDomainSeparator() public {
+        uint256 chainId = 4444;
+        vm.chainId(chainId);
+        assertEq(
+            DOMAIN_SEPARATOR(),
+            keccak256(
+                abi.encode(
+                    keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)"),
+                    keccak256(bytes("EIP712Test")),
+                    chainId,
+                    address(this)
+                )
+            )
+        );
+    }
+}