Change behavior of ceilDiv(0, 0) and improve test coverage

contracts/mocks/token/ERC20Reentrant.sol

@@ -2,7 +2,7 @@
 pragma solidity ^0.8.19;
 
 import "../../token/ERC20/ERC20.sol";
-import "../../token/ERC20/extensions/ERC4626.sol";
+import "../../utils/Address.sol";
 
 contract ERC20Reentrant is ERC20("TEST", "TST") {
     enum Type {

contracts/mocks/token/ERC4626LimitsMock.sol

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.19;
+
+import "../../token/ERC20/extensions/ERC4626.sol";
+
+abstract contract ERC4626LimitsMock is ERC4626 {
+    uint256 _maxDeposit;
+    uint256 _maxMint;
+
+    constructor() {
+        _maxDeposit = 100 ether;
+        _maxMint = 100 ether;
+    }
+
+    function maxDeposit(address) public view override returns (uint256) {
+        return _maxDeposit;
+    }
+
+    function maxMint(address) public view override returns (uint256) {
+        return _maxMint;
+    }
+}

contracts/utils/math/Math.sol

@@ -114,6 +114,11 @@ library Math {
      * of rounding down.
      */
     function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
+        if (b == 0) {
+            // Guarantee the same behavior as in a regular Solidity division.
+            return a / b;
+        }
+
         // (a + b - 1) / b can overflow on addition, so we distribute.
         return a == 0 ? 0 : (a - 1) / b + 1;
     }

test/token/ERC1155/ERC1155.behavior.js

@@ -479,6 +479,14 @@ function shouldBehaveLikeERC1155([minter, firstTokenHolder, secondTokenHolder, m
         );
       });
 
+      it('reverts when transferring from zero address', async function () {
+        await expectRevertCustomError(
+          this.token.$_safeBatchTransferFrom(ZERO_ADDRESS, multiTokenHolder, [firstTokenId], [firstAmount], '0x'),
+          'ERC1155InvalidSender',
+          [ZERO_ADDRESS],
+        );
+      });
+
       function batchTransferWasSuccessful({ operator, from, ids, values }) {
         it('debits transferred balances from sender', async function () {
           const newBalances = await this.token.balanceOfBatch(new Array(ids.length).fill(from), ids);

test/token/ERC20/extensions/ERC4626.test.js

@@ -6,6 +6,7 @@ const { expectRevertCustomError } = require('../../../helpers/customError');
 
 const ERC20Decimals = artifacts.require('$ERC20DecimalsMock');
 const ERC4626 = artifacts.require('$ERC4626');
+const ERC4626LimitsMock = artifacts.require('$ERC4626LimitsMock');
 const ERC4626OffsetMock = artifacts.require('$ERC4626OffsetMock');
 const ERC4626FeesMock = artifacts.require('$ERC4626FeesMock');
 const ERC20ExcessDecimalsMock = artifacts.require('ERC20ExcessDecimalsMock');
@@ -220,6 +221,49 @@ contract('ERC4626', function (accounts) {
     });
   });
 
+  describe('limits', async function () {
+    beforeEach(async function () {
+      this.token = await ERC20Decimals.new(name, symbol, decimals);
+      this.vault = await ERC4626LimitsMock.new(name + ' Vault', symbol + 'V', this.token.address);
+    });
+
+    it('reverts on deposit() above max deposit', async function () {
+      const maxDeposit = await this.vault.maxDeposit(holder);
+      await expectRevertCustomError(this.vault.deposit(maxDeposit.addn(1), recipient), 'ERC4626ExceededMaxDeposit', [
+        recipient,
+        maxDeposit.addn(1),
+        maxDeposit,
+      ]);
+    });
+
+    it('reverts on mint() above max mint', async function () {
+      const maxMint = await this.vault.maxMint(holder);
+      await expectRevertCustomError(this.vault.mint(maxMint.addn(1), recipient), 'ERC4626ExceededMaxMint', [
+        recipient,
+        maxMint.addn(1),
+        maxMint,
+      ]);
+    });
+
+    it('reverts on withdraw() above max withdraw', async function () {
+      const maxWithdraw = await this.vault.maxWithdraw(holder);
+      await expectRevertCustomError(
+        this.vault.withdraw(maxWithdraw.addn(1), recipient, holder),
+        'ERC4626ExceededMaxWithdraw',
+        [holder, maxWithdraw.addn(1), maxWithdraw],
+      );
+    });
+
+    it('reverts on redeem() above max redeem', async function () {
+      const maxRedeem = await this.vault.maxRedeem(holder);
+      await expectRevertCustomError(
+        this.vault.redeem(maxRedeem.addn(1), recipient, holder),
+        'ERC4626ExceededMaxRedeem',
+        [holder, maxRedeem.addn(1), maxRedeem],
+      );
+    });
+  });
+
   for (const offset of [0, 6, 18].map(web3.utils.toBN)) {
     const parseToken = token => web3.utils.toBN(10).pow(decimals).muln(token);
     const parseShare = share => web3.utils.toBN(10).pow(decimals.add(offset)).muln(share);
@@ -849,6 +893,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('0');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('2000');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('0');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '2000',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('2000');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('2000');
     }
@@ -872,6 +919,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4000');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('2000');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('4000');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '6000',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('6000');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('6000');
     }
@@ -883,6 +933,9 @@ contract('ERC4626', function (accounts) {
     expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4000');
     expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('2999'); // used to be 3000, but virtual assets/shares captures part of the yield
     expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('5999'); // used to be 6000, but virtual assets/shares captures part of the yield
+    expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+      '6000',
+    );
     expect(await this.vault.totalSupply()).to.be.bignumber.equal('6000');
     expect(await this.vault.totalAssets()).to.be.bignumber.equal('9000');
 
@@ -904,6 +957,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4000');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('4999');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('6000');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '7333',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('7333');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('11000');
     }
@@ -928,6 +984,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('6000');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('4999'); // used to be 5000
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('9000');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '9333',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('9333');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('14000'); // used to be 14001
     }
@@ -940,6 +999,9 @@ contract('ERC4626', function (accounts) {
     expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('6000');
     expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('6070'); // used to be 6071
     expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('10928'); // used to be 10929
+    expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+      '9333',
+    );
     expect(await this.vault.totalSupply()).to.be.bignumber.equal('9333');
     expect(await this.vault.totalAssets()).to.be.bignumber.equal('17000'); // used to be 17001
 
@@ -961,6 +1023,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('6000');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('3643');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('10929');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '8000',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('8000');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('14573');
     }
@@ -983,6 +1048,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4392');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('3643');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('8000');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '6392',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('6392');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('11644');
     }
@@ -1006,6 +1074,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4392');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('0');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('8000'); // used to be 8001
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '4392',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('4392');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('8001');
     }
@@ -1028,6 +1099,9 @@ contract('ERC4626', function (accounts) {
       expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('0');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('0');
       expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('0');
+      expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
+        '0',
+      );
       expect(await this.vault.totalSupply()).to.be.bignumber.equal('0');
       expect(await this.vault.totalAssets()).to.be.bignumber.equal('1'); // used to be 0
     }

test/token/ERC721/extensions/ERC721Burnable.test.js

@@ -6,7 +6,7 @@ const { expectRevertCustomError } = require('../../../helpers/customError');
 const ERC721Burnable = artifacts.require('$ERC721Burnable');
 
 contract('ERC721Burnable', function (accounts) {
-  const [owner, approved] = accounts;
+  const [owner, approved, another] = accounts;
 
   const firstTokenId = new BN(1);
   const secondTokenId = new BN(2);
@@ -61,6 +61,15 @@ contract('ERC721Burnable', function (accounts) {
         });
       });
 
+      describe('when there is no previous approval burned', function () {
+        it('reverts', async function () {
+          await expectRevertCustomError(this.token.burn(tokenId, { from: another }), 'ERC721InsufficientApproval', [
+            another,
+            tokenId,
+          ]);
+        });
+      });
+
       describe('when the given token ID was not tracked by this contract', function () {
         it('reverts', async function () {
           await expectRevertCustomError(this.token.burn(unknownTokenId, { from: owner }), 'ERC721NonexistentToken', [

test/token/ERC721/extensions/ERC721Consecutive.test.js

@@ -85,6 +85,14 @@ contract('ERC721Consecutive', function (accounts) {
             expect(await this.token.getVotes(account)).to.be.bignumber.equal(web3.utils.toBN(balance));
           }
         });
+
+        it('reverts on consecutive minting to the zero address', async function () {
+          await expectRevertCustomError(
+            ERC721ConsecutiveMock.new(name, symbol, offset, delegates, [ZERO_ADDRESS], [10]),
+            'ERC721InvalidReceiver',
+            [ZERO_ADDRESS],
+          );
+        });
       });
 
       describe('minting after construction', function () {
@@ -172,6 +180,17 @@ contract('ERC721Consecutive', function (accounts) {
           expect(await this.token.$_exists(tokenId)).to.be.equal(true);
           expect(await this.token.ownerOf(tokenId), user2);
         });
+
+        it('reverts burning batches of size != 1', async function () {
+          const tokenId = batches[0].amount + offset;
+          const receiver = batches[0].receiver;
+
+          await expectRevertCustomError(
+            this.token.$_afterTokenTransfer(receiver, ZERO_ADDRESS, tokenId, 2),
+            'ERC721ForbiddenBatchBurn',
+            [],
+          );
+        });
       });
     });
   }

test/utils/math/Math.test.js

@@ -2,6 +2,7 @@ const { BN, constants, expectRevert } = require('@openzeppelin/test-helpers');
 const { expect } = require('chai');
 const { MAX_UINT256 } = constants;
 const { Rounding } = require('../../helpers/enums.js');
+const { expectRevertCustomError } = require('../../helpers/customError.js');
 
 const Math = artifacts.require('$Math');
 
@@ -204,6 +205,19 @@ contract('Math', function () {
   });
 
   describe('ceilDiv', function () {
+    it('reverts on zero division', async function () {
+      const a = new BN('2');
+      const b = new BN('0');
+      // It's unspecified because it's a low level 0 division error
+      await expectRevert.unspecified(this.math.$ceilDiv(a, b));
+    });
+
+    it('does not round up a zero result', async function () {
+      const a = new BN('0');
+      const b = new BN('2');
+      expect(await this.math.$ceilDiv(a, b)).to.be.bignumber.equal('0');
+    });
+
     it('does not round up on exact division', async function () {
       const a = new BN('10');
       const b = new BN('5');
@@ -233,6 +247,10 @@ contract('Math', function () {
       await expectRevert.unspecified(this.math.$mulDiv(1, 1, 0, Rounding.Down));
     });
 
+    it('reverts with result higher than 2 ^ 256', async function () {
+      await expectRevertCustomError(this.math.$mulDiv(5, MAX_UINT256, 2, Rounding.Down), 'MathOverflowedMulDiv', []);
+    });
+
     describe('does round down', async function () {
       it('small values', async function () {
         expect(await this.math.$mulDiv('3', '4', '5', Rounding.Down)).to.be.bignumber.equal('2');

test/utils/structs/Checkpoints.test.js

@@ -4,6 +4,7 @@ const { expect } = require('chai');
 
 const { VALUE_SIZES } = require('../../../scripts/generate/templates/Checkpoints.opts.js');
 const { expectRevertCustomError } = require('../../helpers/customError.js');
+const { expectRevert } = require('@openzeppelin/test-helpers');
 
 const $Checkpoints = artifacts.require('$Checkpoints');
 
@@ -22,6 +23,7 @@ contract('Checkpoints', function () {
     describe(`Trace${length}`, function () {
       beforeEach(async function () {
         this.methods = {
+          at: (...args) => this.mock.methods[`$at_${libraryName}_Trace${length}(uint256,uint32)`](0, ...args),
           latest: (...args) => this.mock.methods[`$latest_${libraryName}_Trace${length}(uint256)`](0, ...args),
           latestCheckpoint: (...args) =>
             this.mock.methods[`$latestCheckpoint_${libraryName}_Trace${length}(uint256)`](0, ...args),
@@ -35,6 +37,11 @@ contract('Checkpoints', function () {
       });
 
       describe('without checkpoints', function () {
+        it('at zero reverts', async function () {
+          // Reverts with array out of bound access, which is unspecified
+          await expectRevert.unspecified(this.methods.at(0));
+        });
+
         it('returns zero as latest value', async function () {
           expect(await this.methods.latest()).to.be.bignumber.equal('0');
 
@@ -65,6 +72,14 @@ contract('Checkpoints', function () {
           }
         });
 
+        it('at keys', async function () {
+          for (const [index, { key, value }] of this.checkpoints.entries()) {
+            const at = await this.methods.at(index);
+            expect(at._value).to.be.bignumber.equal(value);
+            expect(at._key).to.be.bignumber.equal(key);
+          }
+        });
+
         it('length', async function () {
           expect(await this.methods.length()).to.be.bignumber.equal(this.checkpoints.length.toString());
         });