test(erc4626): add ERC4626 a16z tests

.github/workflows/foundry.yml

@@ -79,8 +79,8 @@ jobs:
         type: ["slow", "fast"]
         include:
           - type: "slow"
-            fuzz-runs: 100000
-            max-test-rejects: 500000
+            fuzz-runs: 32768
+            max-test-rejects: 1048576
             invariant-runs: 64
             invariant-depth: 1024
           - type: "fast"

.gitmodules

@@ -14,3 +14,6 @@
 [submodule "lib/morpho-blue-irm"]
 	path = lib/morpho-blue-irm
 	url = https://github.com/morpho-labs/morpho-blue-irm
+[submodule "lib/erc4626-tests"]
+	path = lib/erc4626-tests
+	url = https://github.com/a16z/erc4626-tests

src/mocks/ERC20Mock.sol

@@ -6,6 +6,14 @@ import {ERC20} from "@openzeppelin/token/ERC20/ERC20.sol";
 contract ERC20Mock is ERC20 {
     constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) {}
 
+    function mint(address account, uint256 amount) external {
+        _mint(account, amount);
+    }
+
+    function burn(address account, uint256 amount) external {
+        _burn(account, amount);
+    }
+
     function setBalance(address account, uint256 amount) external {
         _burn(account, balanceOf(account));
         _mint(account, amount);

test/forge/ERC4626Test-a16z.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+pragma solidity ^0.8.0;
+
+import "erc4626-tests/ERC4626.test.sol";
+
+import {BaseTest} from "./helpers/BaseTest.sol";
+
+contract ERC4626StdTest is BaseTest, ERC4626Test {
+    function setUp() public override(BaseTest, ERC4626Test) {
+        super.setUp();
+
+        _underlying_ = address(loanToken);
+        _vault_ = address(vault);
+        _delta_ = 0;
+        _vaultMayBeEmpty = true;
+        _unlimitedAmount = true;
+    }
+}