diff --git a/test/extensions/ERC4626.t.sol b/test/extensions/ERC4626.t.sol
new file mode 100644
index 00000000..9bbf352d
--- /dev/null
+++ b/test/extensions/ERC4626.t.sol
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: WTFPL
+pragma solidity ^0.8.18;
+
+import {Test} from "forge-std/Test.sol";
+import {VyperDeployer} from "utils/VyperDeployer.sol";
+
+import {ERC20Mock} from "../utils/mocks/ERC20Mock.sol";
+
+import {IERC4626Extended} from "./interfaces/IERC4626Extended.sol";
+
+contract ERC4626Test is Test {
+    string private constant _NAME = "TokenisedVaultMock";
+    string private constant _NAME_UNDERLYING = "UnderlyingTokenMock";
+    string private constant _SYMBOL = "TVM";
+    string private constant _SYMBOL_UNDERLYING = "UTM";
+    string private constant _NAME_EIP712 = "TokenisedVaultMock";
+    string private constant _VERSION_EIP712 = "1";
+    uint8 private constant _DECIMALS_OFFSET = 0;
+    bytes32 private constant _TYPE_HASH =
+        keccak256(
+            bytes(
+                "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
+            )
+        );
+    bytes32 private constant _PERMIT_TYPE_HASH =
+        keccak256(
+            bytes(
+                "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
+            )
+        );
+
+    VyperDeployer private vyperDeployer = new VyperDeployer();
+    ERC20Mock private underlying =
+        new ERC20Mock(
+            _NAME_UNDERLYING,
+            _SYMBOL_UNDERLYING,
+            makeAddr("initialAccount"),
+            100
+        );
+
+    /* solhint-disable var-name-mixedcase */
+    IERC4626Extended private ERC4626Extended;
+    bytes32 private _CACHED_DOMAIN_SEPARATOR;
+    /* solhint-enable var-name-mixedcase */
+
+    address private deployer = address(vyperDeployer);
+    address private self = address(this);
+    address private zeroAddress = address(0);
+    // solhint-disable-next-line var-name-mixedcase
+    address private ERC4626ExtendedAddr;
+
+    event Transfer(address indexed from, address indexed to, uint256 value);
+
+    event Approval(
+        address indexed owner,
+        address indexed spender,
+        uint256 value
+    );
+
+    event Deposit(
+        address indexed sender,
+        address indexed owner,
+        uint256 assets,
+        uint256 shares
+    );
+
+    event Withdraw(
+        address indexed sender,
+        address indexed receiver,
+        address indexed owner,
+        uint256 assets,
+        uint256 shares
+    );
+
+    function setUp() public {
+        bytes memory args = abi.encode(
+            _NAME,
+            _SYMBOL,
+            underlying,
+            _DECIMALS_OFFSET,
+            _NAME_EIP712,
+            _VERSION_EIP712
+        );
+        ERC4626Extended = IERC4626Extended(
+            vyperDeployer.deployContract("src/extensions/", "ERC4626", args)
+        );
+        ERC4626ExtendedAddr = address(ERC4626Extended);
+        _CACHED_DOMAIN_SEPARATOR = keccak256(
+            abi.encode(
+                _TYPE_HASH,
+                keccak256(bytes(_NAME_EIP712)),
+                keccak256(bytes(_VERSION_EIP712)),
+                block.chainid,
+                ERC4626ExtendedAddr
+            )
+        );
+    }
+
+    function testInitialSetup() public {
+        assertEq(ERC4626Extended.name(), _NAME);
+        assertEq(ERC4626Extended.decimals(), 18);
+        assertEq(ERC4626Extended.symbol(), _SYMBOL);
+    }
+}
diff --git a/test/extensions/interfaces/IERC4626Extended.sol b/test/extensions/interfaces/IERC4626Extended.sol
new file mode 100644
index 00000000..0178d2c2
--- /dev/null
+++ b/test/extensions/interfaces/IERC4626Extended.sol
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: WTFPL
+pragma solidity ^0.8.18;
+
+import {IERC20Metadata} from "openzeppelin/token/ERC20/extensions/IERC20Metadata.sol";
+import {IERC20Permit} from "openzeppelin/token/ERC20/extensions/IERC20Permit.sol";
+import {IERC4626} from "openzeppelin/interfaces/IERC4626.sol";
+
+interface IERC4626Extended is IERC20Metadata, IERC20Permit, IERC4626 {}