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Remove enumerable from ERC721 and add an ERC721Enumerable extension (#2511)

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Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
This commit is contained in:
Hadrien Croubois
2021-02-19 17:24:39 +01:00
committed by GitHub
parent 7d20d0e2d2
commit 09734e8028
11 changed files with 1250 additions and 1035 deletions
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1
CHANGELOG.md
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@ -10,6 +10,7 @@
* `GSN`: Deprecate GSNv1 support in favor of upcomming support for GSNv2. ([#2521](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2521))
* `ERC165`: Remove uses of storage in the base ERC165 implementation. ERC165 based contracts now use storage-less virtual functions. Old behaviour remains available in the `ERC165Storage` extension. ([#2505](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2505))
* `Initializable`: Make initializer check stricter during construction. ([#2531](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2531))
* `ERC721`: remove enumerability of tokens from the base implementation. This feature is now provided separately through the `ERC721Enumerable` extension. ([#2511](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2511))
## 3.4.0 (2021-02-02)

43
contracts/mocks/ERC721EnumerableMock.sol Normal file
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@ -0,0 +1,43 @@
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../token/ERC721/ERC721Enumerable.sol";
/**
* @title ERC721Mock
* This mock just provides a public safeMint, mint, and burn functions for testing purposes
*/
contract ERC721EnumerableMock is ERC721Enumerable {
string private _baseTokenURI;
constructor (string memory name, string memory symbol) ERC721(name, symbol) { }
function _baseURI() internal view virtual override returns (string memory) {
return _baseTokenURI;
}
function setBaseURI(string calldata newBaseTokenURI) public {
_baseTokenURI = newBaseTokenURI;
}
function baseURI() public view returns (string memory) {
return _baseURI();
}
function mint(address to, uint256 tokenId) public {
_mint(to, tokenId);
}
function safeMint(address to, uint256 tokenId) public {
_safeMint(to, tokenId);
}
function safeMint(address to, uint256 tokenId, bytes memory _data) public {
_safeMint(to, tokenId, _data);
}
function burn(uint256 tokenId) public {
_burn(tokenId);
}
}

22
contracts/mocks/ERC721Mock.sol
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@ -9,20 +9,26 @@ import "../token/ERC721/ERC721.sol";
* This mock just provides a public safeMint, mint, and burn functions for testing purposes
*/
contract ERC721Mock is ERC721 {
string private _baseTokenURI;
constructor (string memory name, string memory symbol) ERC721(name, symbol) { }
function _baseURI() internal view virtual override returns (string memory) {
return _baseTokenURI;
}
function setBaseURI(string calldata newBaseTokenURI) public {
_baseTokenURI = newBaseTokenURI;
}
function baseURI() public view returns (string memory) {
return _baseURI();
}
function exists(uint256 tokenId) public view returns (bool) {
return _exists(tokenId);
}
function setTokenURI(uint256 tokenId, string memory uri) public {
_setTokenURI(tokenId, uri);
}
function setBaseURI(string memory baseURI) public {
_setBaseURI(baseURI);
}
function mint(address to, uint256 tokenId) public {
_mint(to, tokenId);
}

22
contracts/presets/ERC721PresetMinterPauserAutoId.sol
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@ -6,6 +6,7 @@ import "../access/AccessControl.sol";
import "../utils/Context.sol";
import "../utils/Counters.sol";
import "../token/ERC721/ERC721.sol";
import "../token/ERC721/ERC721Enumerable.sol";
import "../token/ERC721/ERC721Burnable.sol";
import "../token/ERC721/ERC721Pausable.sol";
@ -24,7 +25,7 @@ import "../token/ERC721/ERC721Pausable.sol";
* roles, as well as the default admin role, which will let it grant both minter
* and pauser roles to other accounts.
*/
contract ERC721PresetMinterPauserAutoId is Context, AccessControl, ERC721Burnable, ERC721Pausable {
contract ERC721PresetMinterPauserAutoId is Context, AccessControl, ERC721Enumerable, ERC721Burnable, ERC721Pausable {
using Counters for Counters.Counter;
bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
@ -32,6 +33,8 @@ contract ERC721PresetMinterPauserAutoId is Context, AccessControl, ERC721Burnabl
Counters.Counter private _tokenIdTracker;
string private _baseTokenURI;
/**
* @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
* account that deploys the contract.
@ -39,13 +42,17 @@ contract ERC721PresetMinterPauserAutoId is Context, AccessControl, ERC721Burnabl
* Token URIs will be autogenerated based on `baseURI` and their token IDs.
* See {ERC721-tokenURI}.
*/
constructor(string memory name, string memory symbol, string memory baseURI) ERC721(name, symbol) {
constructor(string memory name, string memory symbol, string memory baseTokenURI) ERC721(name, symbol) {
_baseTokenURI = baseTokenURI;
_setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
_setupRole(MINTER_ROLE, _msgSender());
_setupRole(PAUSER_ROLE, _msgSender());
}
_setBaseURI(baseURI);
function _baseURI() internal view virtual override returns (string memory) {
return _baseTokenURI;
}
/**
@ -96,7 +103,14 @@ contract ERC721PresetMinterPauserAutoId is Context, AccessControl, ERC721Burnabl
_unpause();
}
function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override(ERC721, ERC721Pausable) {
function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override(ERC721, ERC721Enumerable, ERC721Pausable) {
super._beforeTokenTransfer(from, to, tokenId);
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, ERC721Enumerable) returns (bool) {
return super.supportsInterface(interfaceId);
}
}

148
contracts/token/ERC721/ERC721.sol
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@ -5,47 +5,37 @@ pragma solidity ^0.8.0;
import "../../utils/Context.sol";
import "./IERC721.sol";
import "./IERC721Metadata.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Receiver.sol";
import "../../introspection/ERC165.sol";
import "../../utils/Address.sol";
import "../../utils/EnumerableSet.sol";
import "../../utils/EnumerableMap.sol";
import "../../utils/Strings.sol";
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://eips.ethereum.org/EIPS/eip-721
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using EnumerableSet for EnumerableSet.UintSet;
using EnumerableMap for EnumerableMap.UintToAddressMap;
using Strings for uint256;
// Mapping from holder address to their (enumerable) set of owned tokens
mapping (address => EnumerableSet.UintSet) private _holderTokens;
// Enumerable mapping from token ids to their owners
EnumerableMap.UintToAddressMap private _tokenOwners;
// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) private _operatorApprovals;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Optional mapping for token URIs
mapping (uint256 => string) private _tokenURIs;
// Mapping from token ID to owner address
mapping (uint256 => address) private _owners;
// Base URI
string private _baseURI;
// Mapping owner address to token count
mapping (address => uint256) private _balances;
// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
@ -61,7 +51,6 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return interfaceId == type(IERC721).interfaceId
|| interfaceId == type(IERC721Metadata).interfaceId
|| interfaceId == type(IERC721Enumerable).interfaceId
|| super.supportsInterface(interfaceId);
}
@ -70,14 +59,16 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _holderTokens[owner].length();
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
@ -100,51 +91,18 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory _tokenURI = _tokenURIs[tokenId];
string memory base = baseURI();
// If there is no base URI, return the token URI.
if (bytes(base).length == 0) {
return _tokenURI;
}
// If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
if (bytes(_tokenURI).length > 0) {
return string(abi.encodePacked(base, _tokenURI));
}
// If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
return string(abi.encodePacked(base, tokenId.toString()));
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0
? string(abi.encodePacked(baseURI, tokenId.toString()))
: '';
}
/**
* @dev Returns the base URI set via {_setBaseURI}. This will be
* automatically added as a prefix in {tokenURI} to each token's URI, or
* to the token ID if no specific URI is set for that token ID.
*/
function baseURI() public view virtual returns (string memory) {
return _baseURI;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
* @dev Base URI for computing {tokenURI}. Empty by default, can be overriden
* in child contracts.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
return _holderTokens[owner].at(index);
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
// _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
return _tokenOwners.length();
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
(uint256 tokenId, ) = _tokenOwners.at(index);
return tokenId;
function _baseURI() internal view virtual returns (string memory) {
return "";
}
/**
@ -244,7 +202,7 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _tokenOwners.contains(tokenId);
return _owners[tokenId] != address(0);
}
/**
@ -301,9 +259,8 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
_beforeTokenTransfer(address(0), to, tokenId);
_holderTokens[to].add(tokenId);
_tokenOwners.set(tokenId, to);
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(address(0), to, tokenId);
}
@ -319,21 +276,15 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId); // internal owner
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
// Clear metadata (if any)
if (bytes(_tokenURIs[tokenId]).length != 0) {
delete _tokenURIs[tokenId];
}
_holderTokens[owner].remove(tokenId);
_tokenOwners.remove(tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
}
@ -350,7 +301,7 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
* Emits a {Transfer} event.
*/
function _transfer(address from, address to, uint256 tokenId) internal virtual {
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
@ -358,33 +309,21 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_holderTokens[from].remove(tokenId);
_holderTokens[to].add(tokenId);
_tokenOwners.set(tokenId, to);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
* @dev Approve `to` to operate on `tokenId`
*
* Requirements:
*
* - `tokenId` must exist.
* Emits a {Approval} event.
*/
function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
_tokenURIs[tokenId] = _tokenURI;
}
/**
* @dev Internal function to set the base URI for all token IDs. It is
* automatically added as a prefix to the value returned in {tokenURI},
* or to the token ID if {tokenURI} is empty.
*/
function _setBaseURI(string memory baseURI_) internal virtual {
_baseURI = baseURI_;
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
@ -418,11 +357,6 @@ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable
}
}
function _approve(address to, uint256 tokenId) private {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.

159
contracts/token/ERC721/ERC721Enumerable.sol Normal file
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@ -0,0 +1,159 @@
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./ERC721.sol";
import "./IERC721Enumerable.sol";
/**
* @dev This implements an optional extension of {ERC721} defined in the EIP that adds
* enumerability of all the token ids in the contract as well as all token ids owned by each
* account.
*/
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId
|| super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
return _ownedTokens[owner][index];
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _allTokens.length;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
return _allTokens[index];
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override {
super._beforeTokenTransfer(from, to, tokenId);
if (from == address(0)) {
_addTokenToAllTokensEnumeration(tokenId);
} else if (from != to) {
_removeTokenFromOwnerEnumeration(from, tokenId);
}
if (to == address(0)) {
_removeTokenFromAllTokensEnumeration(tokenId);
} else if (to != from) {
_addTokenToOwnerEnumeration(to, tokenId);
}
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @param to address representing the new owner of the given token ID
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
uint256 length = ERC721.balanceOf(to);
_ownedTokens[to][length] = tokenId;
_ownedTokensIndex[tokenId] = length;
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @param from address representing the previous owner of the given token ID
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
delete _ownedTokensIndex[tokenId];
delete _ownedTokens[from][lastTokenIndex];
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length - 1;
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
delete _allTokensIndex[tokenId];
_allTokens.pop();
}
}

4
contracts/token/ERC721/README.adoc
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@ -7,7 +7,7 @@ This set of interfaces, contracts, and utilities are all related to the https://
TIP: For a walk through on how to create an ERC721 token read our xref:ROOT:erc721.adoc[ERC721 guide].
The EIP consists of three interfaces, found here as {IERC721}, {IERC721Metadata}, and {IERC721Enumerable}. Only the first one is required in a contract to be ERC721 compliant. However, all three are implemented in {ERC721}.
The EIP consists of three interfaces, found here as {IERC721}, {IERC721Metadata}, and {IERC721Enumerable}. Only the first one is required in a contract to be ERC721 compliant. The core interface and the metadata extension are both implemented in {ERC721}. The enumerable extension is provided separately in {ERC721Enumerable}.
Additionally, {IERC721Receiver} can be used to prevent tokens from becoming forever locked in contracts. Imagine sending an in-game item to an exchange address that can't send it back!. When using <<IERC721-safeTransferFrom,`safeTransferFrom`>>, the token contract checks to see that the receiver is an {IERC721Receiver}, which implies that it knows how to handle {ERC721} tokens. If you're writing a contract that needs to receive {ERC721} tokens, you'll want to include this interface.
@ -29,6 +29,8 @@ NOTE: This core set of contracts is designed to be unopinionated, allowing devel
{{ERC721}}
{{ERC721Enumerable}}
{{IERC721Receiver}}
== Extensions

4
test/presets/ERC721PresetMinterPauserAutoId.test.js
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@ -27,10 +27,6 @@ contract('ERC721PresetMinterPauserAutoId', function (accounts) {
expect(await this.token.symbol()).to.equal(symbol);
});
it('token has correct base URI', async function () {
expect(await this.token.baseURI()).to.equal(baseURI);
});
it('deployer has the default admin role', async function () {
expect(await this.token.getRoleMemberCount(DEFAULT_ADMIN_ROLE)).to.be.bignumber.equal('1');
expect(await this.token.getRoleMember(DEFAULT_ADMIN_ROLE, 0)).to.equal(deployer);

945
test/token/ERC721/ERC721.behavior.js Normal file
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@ -0,0 +1,945 @@
const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
const { expect } = require('chai');
const { ZERO_ADDRESS } = constants;
const { shouldSupportInterfaces } = require('../../introspection/SupportsInterface.behavior');
const ERC721ReceiverMock = artifacts.require('ERC721ReceiverMock');
const Error = [ 'None', 'RevertWithMessage', 'RevertWithoutMessage', 'Panic' ]
.reduce((acc, entry, idx) => Object.assign({ [entry]: idx }, acc), {});
const firstTokenId = new BN('5042');
const secondTokenId = new BN('79217');
const nonExistentTokenId = new BN('13');
const baseURI = 'https://api.com/v1/';
const RECEIVER_MAGIC_VALUE = '0x150b7a02';
function shouldBehaveLikeERC721 (errorPrefix, owner, newOwner, approved, anotherApproved, operator, other) {
shouldSupportInterfaces([
'ERC165',
'ERC721',
]);
context('with minted tokens', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
await this.token.mint(owner, secondTokenId);
this.toWhom = other; // default to other for toWhom in context-dependent tests
});
describe('balanceOf', function () {
context('when the given address owns some tokens', function () {
it('returns the amount of tokens owned by the given address', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('2');
});
});
context('when the given address does not own any tokens', function () {
it('returns 0', async function () {
expect(await this.token.balanceOf(other)).to.be.bignumber.equal('0');
});
});
context('when querying the zero address', function () {
it('throws', async function () {
await expectRevert(
this.token.balanceOf(ZERO_ADDRESS), 'ERC721: balance query for the zero address',
);
});
});
});
describe('ownerOf', function () {
context('when the given token ID was tracked by this token', function () {
const tokenId = firstTokenId;
it('returns the owner of the given token ID', async function () {
expect(await this.token.ownerOf(tokenId)).to.be.equal(owner);
});
});
context('when the given token ID was not tracked by this token', function () {
const tokenId = nonExistentTokenId;
it('reverts', async function () {
await expectRevert(
this.token.ownerOf(tokenId), 'ERC721: owner query for nonexistent token',
);
});
});
});
describe('transfers', function () {
const tokenId = firstTokenId;
const data = '0x42';
let logs = null;
beforeEach(async function () {
await this.token.approve(approved, tokenId, { from: owner });
await this.token.setApprovalForAll(operator, true, { from: owner });
});
const transferWasSuccessful = function ({ owner, tokenId, approved }) {
it('transfers the ownership of the given token ID to the given address', async function () {
expect(await this.token.ownerOf(tokenId)).to.be.equal(this.toWhom);
});
it('emits a Transfer event', async function () {
expectEvent.inLogs(logs, 'Transfer', { from: owner, to: this.toWhom, tokenId: tokenId });
});
it('clears the approval for the token ID', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(ZERO_ADDRESS);
});
it('emits an Approval event', async function () {
expectEvent.inLogs(logs, 'Approval', { owner, approved: ZERO_ADDRESS, tokenId: tokenId });
});
it('adjusts owners balances', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('1');
});
it('adjusts owners tokens by index', async function () {
if (!this.token.tokenOfOwnerByIndex) return;
expect(await this.token.tokenOfOwnerByIndex(this.toWhom, 0)).to.be.bignumber.equal(tokenId);
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.not.equal(tokenId);
});
};
const shouldTransferTokensByUsers = function (transferFunction) {
context('when called by the owner', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: owner }));
});
transferWasSuccessful({ owner, tokenId, approved });
});
context('when called by the approved individual', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: approved }));
});
transferWasSuccessful({ owner, tokenId, approved });
});
context('when called by the operator', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: operator }));
});
transferWasSuccessful({ owner, tokenId, approved });
});
context('when called by the owner without an approved user', function () {
beforeEach(async function () {
await this.token.approve(ZERO_ADDRESS, tokenId, { from: owner });
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: operator }));
});
transferWasSuccessful({ owner, tokenId, approved: null });
});
context('when sent to the owner', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, owner, tokenId, { from: owner }));
});
it('keeps ownership of the token', async function () {
expect(await this.token.ownerOf(tokenId)).to.be.equal(owner);
});
it('clears the approval for the token ID', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(ZERO_ADDRESS);
});
it('emits only a transfer event', async function () {
expectEvent.inLogs(logs, 'Transfer', {
from: owner,
to: owner,
tokenId: tokenId,
});
});
it('keeps the owner balance', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('2');
});
it('keeps same tokens by index', async function () {
if (!this.token.tokenOfOwnerByIndex) return;
const tokensListed = await Promise.all(
[0, 1].map(i => this.token.tokenOfOwnerByIndex(owner, i)),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members(
[firstTokenId.toNumber(), secondTokenId.toNumber()],
);
});
});
context('when the address of the previous owner is incorrect', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, other, other, tokenId, { from: owner }),
'ERC721: transfer of token that is not own',
);
});
});
context('when the sender is not authorized for the token id', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, owner, other, tokenId, { from: other }),
'ERC721: transfer caller is not owner nor approved',
);
});
});
context('when the given token ID does not exist', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, owner, other, nonExistentTokenId, { from: owner }),
'ERC721: operator query for nonexistent token',
);
});
});
context('when the address to transfer the token to is the zero address', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, owner, ZERO_ADDRESS, tokenId, { from: owner }),
'ERC721: transfer to the zero address',
);
});
});
};
describe('via transferFrom', function () {
shouldTransferTokensByUsers(function (from, to, tokenId, opts) {
return this.token.transferFrom(from, to, tokenId, opts);
});
});
describe('via safeTransferFrom', function () {
const safeTransferFromWithData = function (from, to, tokenId, opts) {
return this.token.methods['safeTransferFrom(address,address,uint256,bytes)'](from, to, tokenId, data, opts);
};
const safeTransferFromWithoutData = function (from, to, tokenId, opts) {
return this.token.methods['safeTransferFrom(address,address,uint256)'](from, to, tokenId, opts);
};
const shouldTransferSafely = function (transferFun, data) {
describe('to a user account', function () {
shouldTransferTokensByUsers(transferFun);
});
describe('to a valid receiver contract', function () {
beforeEach(async function () {
this.receiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.None);
this.toWhom = this.receiver.address;
});
shouldTransferTokensByUsers(transferFun);
it('calls onERC721Received', async function () {
const receipt = await transferFun.call(this, owner, this.receiver.address, tokenId, { from: owner });
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
operator: owner,
from: owner,
tokenId: tokenId,
data: data,
});
});
it('calls onERC721Received from approved', async function () {
const receipt = await transferFun.call(this, owner, this.receiver.address, tokenId, { from: approved });
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
operator: approved,
from: owner,
tokenId: tokenId,
data: data,
});
});
describe('with an invalid token id', function () {
it('reverts', async function () {
await expectRevert(
transferFun.call(
this,
owner,
this.receiver.address,
nonExistentTokenId,
{ from: owner },
),
'ERC721: operator query for nonexistent token',
);
});
});
});
};
describe('with data', function () {
shouldTransferSafely(safeTransferFromWithData, data);
});
describe('without data', function () {
shouldTransferSafely(safeTransferFromWithoutData, null);
});
describe('to a receiver contract returning unexpected value', function () {
it('reverts', async function () {
const invalidReceiver = await ERC721ReceiverMock.new('0x42', Error.None);
await expectRevert(
this.token.safeTransferFrom(owner, invalidReceiver.address, tokenId, { from: owner }),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
describe('to a receiver contract that reverts with message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithMessage);
await expectRevert(
this.token.safeTransferFrom(owner, revertingReceiver.address, tokenId, { from: owner }),
'ERC721ReceiverMock: reverting',
);
});
});
describe('to a receiver contract that reverts without message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithoutMessage);
await expectRevert(
this.token.safeTransferFrom(owner, revertingReceiver.address, tokenId, { from: owner }),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
describe('to a receiver contract that panics', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.Panic);
await expectRevert.unspecified(
this.token.safeTransferFrom(owner, revertingReceiver.address, tokenId, { from: owner }),
);
});
});
describe('to a contract that does not implement the required function', function () {
it('reverts', async function () {
const nonReceiver = this.token;
await expectRevert(
this.token.safeTransferFrom(owner, nonReceiver.address, tokenId, { from: owner }),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
});
});
describe('safe mint', function () {
const fourthTokenId = new BN(4);
const tokenId = fourthTokenId;
const data = '0x42';
describe('via safeMint', function () { // regular minting is tested in ERC721Mintable.test.js and others
it('calls onERC721Received — with data', async function () {
this.receiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.None);
const receipt = await this.token.safeMint(this.receiver.address, tokenId, data);
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
from: ZERO_ADDRESS,
tokenId: tokenId,
data: data,
});
});
it('calls onERC721Received — without data', async function () {
this.receiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.None);
const receipt = await this.token.safeMint(this.receiver.address, tokenId);
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
from: ZERO_ADDRESS,
tokenId: tokenId,
});
});
context('to a receiver contract returning unexpected value', function () {
it('reverts', async function () {
const invalidReceiver = await ERC721ReceiverMock.new('0x42', Error.None);
await expectRevert(
this.token.safeMint(invalidReceiver.address, tokenId),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
context('to a receiver contract that reverts with message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithMessage);
await expectRevert(
this.token.safeMint(revertingReceiver.address, tokenId),
'ERC721ReceiverMock: reverting',
);
});
});
context('to a receiver contract that reverts without message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithoutMessage);
await expectRevert(
this.token.safeMint(revertingReceiver.address, tokenId),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
context('to a receiver contract that panics', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.Panic);
await expectRevert.unspecified(
this.token.safeMint(revertingReceiver.address, tokenId),
);
});
});
context('to a contract that does not implement the required function', function () {
it('reverts', async function () {
const nonReceiver = this.token;
await expectRevert(
this.token.safeMint(nonReceiver.address, tokenId),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
});
});
describe('approve', function () {
const tokenId = firstTokenId;
let logs = null;
const itClearsApproval = function () {
it('clears approval for the token', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(ZERO_ADDRESS);
});
};
const itApproves = function (address) {
it('sets the approval for the target address', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(address);
});
};
const itEmitsApprovalEvent = function (address) {
it('emits an approval event', async function () {
expectEvent.inLogs(logs, 'Approval', {
owner: owner,
approved: address,
tokenId: tokenId,
});
});
};
context('when clearing approval', function () {
context('when there was no prior approval', function () {
beforeEach(async function () {
({ logs } = await this.token.approve(ZERO_ADDRESS, tokenId, { from: owner }));
});
itClearsApproval();
itEmitsApprovalEvent(ZERO_ADDRESS);
});
context('when there was a prior approval', function () {
beforeEach(async function () {
await this.token.approve(approved, tokenId, { from: owner });
({ logs } = await this.token.approve(ZERO_ADDRESS, tokenId, { from: owner }));
});
itClearsApproval();
itEmitsApprovalEvent(ZERO_ADDRESS);
});
});
context('when approving a non-zero address', function () {
context('when there was no prior approval', function () {
beforeEach(async function () {
({ logs } = await this.token.approve(approved, tokenId, { from: owner }));
});
itApproves(approved);
itEmitsApprovalEvent(approved);
});
context('when there was a prior approval to the same address', function () {
beforeEach(async function () {
await this.token.approve(approved, tokenId, { from: owner });
({ logs } = await this.token.approve(approved, tokenId, { from: owner }));
});
itApproves(approved);
itEmitsApprovalEvent(approved);
});
context('when there was a prior approval to a different address', function () {
beforeEach(async function () {
await this.token.approve(anotherApproved, tokenId, { from: owner });
({ logs } = await this.token.approve(anotherApproved, tokenId, { from: owner }));
});
itApproves(anotherApproved);
itEmitsApprovalEvent(anotherApproved);
});
});
context('when the address that receives the approval is the owner', function () {
it('reverts', async function () {
await expectRevert(
this.token.approve(owner, tokenId, { from: owner }), 'ERC721: approval to current owner',
);
});
});
context('when the sender does not own the given token ID', function () {
it('reverts', async function () {
await expectRevert(this.token.approve(approved, tokenId, { from: other }),
'ERC721: approve caller is not owner nor approved');
});
});
context('when the sender is approved for the given token ID', function () {
it('reverts', async function () {
await this.token.approve(approved, tokenId, { from: owner });
await expectRevert(this.token.approve(anotherApproved, tokenId, { from: approved }),
'ERC721: approve caller is not owner nor approved for all');
});
});
context('when the sender is an operator', function () {
beforeEach(async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
({ logs } = await this.token.approve(approved, tokenId, { from: operator }));
});
itApproves(approved);
itEmitsApprovalEvent(approved);
});
context('when the given token ID does not exist', function () {
it('reverts', async function () {
await expectRevert(this.token.approve(approved, nonExistentTokenId, { from: operator }),
'ERC721: owner query for nonexistent token');
});
});
});
describe('setApprovalForAll', function () {
context('when the operator willing to approve is not the owner', function () {
context('when there is no operator approval set by the sender', function () {
it('approves the operator', async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(true);
});
it('emits an approval event', async function () {
const { logs } = await this.token.setApprovalForAll(operator, true, { from: owner });
expectEvent.inLogs(logs, 'ApprovalForAll', {
owner: owner,
operator: operator,
approved: true,
});
});
});
context('when the operator was set as not approved', function () {
beforeEach(async function () {
await this.token.setApprovalForAll(operator, false, { from: owner });
});
it('approves the operator', async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(true);
});
it('emits an approval event', async function () {
const { logs } = await this.token.setApprovalForAll(operator, true, { from: owner });
expectEvent.inLogs(logs, 'ApprovalForAll', {
owner: owner,
operator: operator,
approved: true,
});
});
it('can unset the operator approval', async function () {
await this.token.setApprovalForAll(operator, false, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(false);
});
});
context('when the operator was already approved', function () {
beforeEach(async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
});
it('keeps the approval to the given address', async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(true);
});
it('emits an approval event', async function () {
const { logs } = await this.token.setApprovalForAll(operator, true, { from: owner });
expectEvent.inLogs(logs, 'ApprovalForAll', {
owner: owner,
operator: operator,
approved: true,
});
});
});
});
context('when the operator is the owner', function () {
it('reverts', async function () {
await expectRevert(this.token.setApprovalForAll(owner, true, { from: owner }),
'ERC721: approve to caller');
});
});
});
describe('getApproved', async function () {
context('when token is not minted', async function () {
it('reverts', async function () {
await expectRevert(
this.token.getApproved(nonExistentTokenId),
'ERC721: approved query for nonexistent token',
);
});
});
context('when token has been minted ', async function () {
it('should return the zero address', async function () {
expect(await this.token.getApproved(firstTokenId)).to.be.equal(
ZERO_ADDRESS,
);
});
context('when account has been approved', async function () {
beforeEach(async function () {
await this.token.approve(approved, firstTokenId, { from: owner });
});
it('returns approved account', async function () {
expect(await this.token.getApproved(firstTokenId)).to.be.equal(approved);
});
});
});
});
});
describe('_mint(address, uint256)', function () {
it('reverts with a null destination address', async function () {
await expectRevert(
this.token.mint(ZERO_ADDRESS, firstTokenId), 'ERC721: mint to the zero address',
);
});
context('with minted token', async function () {
beforeEach(async function () {
({ logs: this.logs } = await this.token.mint(owner, firstTokenId));
});
it('emits a Transfer event', function () {
expectEvent.inLogs(this.logs, 'Transfer', { from: ZERO_ADDRESS, to: owner, tokenId: firstTokenId });
});
it('creates the token', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('1');
expect(await this.token.ownerOf(firstTokenId)).to.equal(owner);
});
it('reverts when adding a token id that already exists', async function () {
await expectRevert(this.token.mint(owner, firstTokenId), 'ERC721: token already minted');
});
});
});
describe('_burn', function () {
it('reverts when burning a non-existent token id', async function () {
await expectRevert(
this.token.burn(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
context('with minted tokens', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
await this.token.mint(owner, secondTokenId);
});
context('with burnt token', function () {
beforeEach(async function () {
({ logs: this.logs } = await this.token.burn(firstTokenId));
});
it('emits a Transfer event', function () {
expectEvent.inLogs(this.logs, 'Transfer', { from: owner, to: ZERO_ADDRESS, tokenId: firstTokenId });
});
it('emits an Approval event', function () {
expectEvent.inLogs(this.logs, 'Approval', { owner, approved: ZERO_ADDRESS, tokenId: firstTokenId });
});
it('deletes the token', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('1');
await expectRevert(
this.token.ownerOf(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
it('reverts when burning a token id that has been deleted', async function () {
await expectRevert(
this.token.burn(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
});
});
});
}
function shouldBehaveLikeERC721Enumerable (errorPrefix, owner, newOwner, approved, anotherApproved, operator, other) {
shouldSupportInterfaces([
'ERC721Enumerable',
]);
context('with minted tokens', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
await this.token.mint(owner, secondTokenId);
this.toWhom = other; // default to other for toWhom in context-dependent tests
});
describe('totalSupply', function () {
it('returns total token supply', async function () {
expect(await this.token.totalSupply()).to.be.bignumber.equal('2');
});
});
describe('tokenOfOwnerByIndex', function () {
describe('when the given index is lower than the amount of tokens owned by the given address', function () {
it('returns the token ID placed at the given index', async function () {
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.equal(firstTokenId);
});
});
describe('when the index is greater than or equal to the total tokens owned by the given address', function () {
it('reverts', async function () {
await expectRevert(
this.token.tokenOfOwnerByIndex(owner, 2), 'ERC721Enumerable: owner index out of bounds',
);
});
});
describe('when the given address does not own any token', function () {
it('reverts', async function () {
await expectRevert(
this.token.tokenOfOwnerByIndex(other, 0), 'ERC721Enumerable: owner index out of bounds',
);
});
});
describe('after transferring all tokens to another user', function () {
beforeEach(async function () {
await this.token.transferFrom(owner, other, firstTokenId, { from: owner });
await this.token.transferFrom(owner, other, secondTokenId, { from: owner });
});
it('returns correct token IDs for target', async function () {
expect(await this.token.balanceOf(other)).to.be.bignumber.equal('2');
const tokensListed = await Promise.all(
[0, 1].map(i => this.token.tokenOfOwnerByIndex(other, i)),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members([firstTokenId.toNumber(),
secondTokenId.toNumber()]);
});
it('returns empty collection for original owner', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('0');
await expectRevert(
this.token.tokenOfOwnerByIndex(owner, 0), 'ERC721Enumerable: owner index out of bounds',
);
});
});
});
describe('tokenByIndex', function () {
it('returns all tokens', async function () {
const tokensListed = await Promise.all(
[0, 1].map(i => this.token.tokenByIndex(i)),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members([firstTokenId.toNumber(),
secondTokenId.toNumber()]);
});
it('reverts if index is greater than supply', async function () {
await expectRevert(
this.token.tokenByIndex(2), 'ERC721Enumerable: global index out of bounds',
);
});
[firstTokenId, secondTokenId].forEach(function (tokenId) {
it(`returns all tokens after burning token ${tokenId} and minting new tokens`, async function () {
const newTokenId = new BN(300);
const anotherNewTokenId = new BN(400);
await this.token.burn(tokenId);
await this.token.mint(newOwner, newTokenId);
await this.token.mint(newOwner, anotherNewTokenId);
expect(await this.token.totalSupply()).to.be.bignumber.equal('3');
const tokensListed = await Promise.all(
[0, 1, 2].map(i => this.token.tokenByIndex(i)),
);
const expectedTokens = [firstTokenId, secondTokenId, newTokenId, anotherNewTokenId].filter(
x => (x !== tokenId),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members(expectedTokens.map(t => t.toNumber()));
});
});
});
});
describe('_mint(address, uint256)', function () {
it('reverts with a null destination address', async function () {
await expectRevert(
this.token.mint(ZERO_ADDRESS, firstTokenId), 'ERC721: mint to the zero address',
);
});
context('with minted token', async function () {
beforeEach(async function () {
({ logs: this.logs } = await this.token.mint(owner, firstTokenId));
});
it('adjusts owner tokens by index', async function () {
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.equal(firstTokenId);
});
it('adjusts all tokens list', async function () {
expect(await this.token.tokenByIndex(0)).to.be.bignumber.equal(firstTokenId);
});
});
});
describe('_burn', function () {
it('reverts when burning a non-existent token id', async function () {
await expectRevert(
this.token.burn(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
context('with minted tokens', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
await this.token.mint(owner, secondTokenId);
});
context('with burnt token', function () {
beforeEach(async function () {
({ logs: this.logs } = await this.token.burn(firstTokenId));
});
it('removes that token from the token list of the owner', async function () {
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.equal(secondTokenId);
});
it('adjusts all tokens list', async function () {
expect(await this.token.tokenByIndex(0)).to.be.bignumber.equal(secondTokenId);
});
it('burns all tokens', async function () {
await this.token.burn(secondTokenId, { from: owner });
expect(await this.token.totalSupply()).to.be.bignumber.equal('0');
await expectRevert(
this.token.tokenByIndex(0), 'ERC721Enumerable: global index out of bounds',
);
});
});
});
});
}
function shouldBehaveLikeERC721Metadata (errorPrefix, name, symbol, owner) {
shouldSupportInterfaces([
'ERC721Metadata',
]);
describe('metadata', function () {
it('has a name', async function () {
expect(await this.token.name()).to.be.equal(name);
});
it('has a symbol', async function () {
expect(await this.token.symbol()).to.be.equal(symbol);
});
describe('token URI', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
});
it('return empty string by default', async function () {
expect(await this.token.tokenURI(firstTokenId)).to.be.equal('');
});
it('reverts when queried for non existent token id', async function () {
await expectRevert(
this.token.tokenURI(nonExistentTokenId), 'ERC721Metadata: URI query for nonexistent token',
);
});
describe('base URI', function () {
beforeEach(function () {
if (this.token.setBaseURI === undefined) {
this.skip();
}
});
it('base URI can be set', async function () {
await this.token.setBaseURI(baseURI);
expect(await this.token.baseURI()).to.equal(baseURI);
});
it('base URI is added as a prefix to the token URI', async function () {
await this.token.setBaseURI(baseURI);
expect(await this.token.tokenURI(firstTokenId)).to.be.equal(baseURI + firstTokenId.toString());
});
it('token URI can be changed by changing the base URI', async function () {
await this.token.setBaseURI(baseURI);
const newBaseURI = 'https://api.com/v2/';
await this.token.setBaseURI(newBaseURI);
expect(await this.token.tokenURI(firstTokenId)).to.be.equal(newBaseURI + firstTokenId.toString());
});
});
});
});
}
module.exports = {
shouldBehaveLikeERC721,
shouldBehaveLikeERC721Enumerable,
shouldBehaveLikeERC721Metadata,
};

917
test/token/ERC721/ERC721.test.js
View File

@ -1,923 +1,18 @@
const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
const { ZERO_ADDRESS } = constants;
const { expect } = require('chai');
const { shouldSupportInterfaces } = require('../../introspection/SupportsInterface.behavior');
const {
shouldBehaveLikeERC721,
shouldBehaveLikeERC721Metadata,
} = require('./ERC721.behavior');
const ERC721Mock = artifacts.require('ERC721Mock');
const ERC721ReceiverMock = artifacts.require('ERC721ReceiverMock');
const Error = [ 'None', 'RevertWithMessage', 'RevertWithoutMessage', 'Panic' ]
.reduce((acc, entry, idx) => Object.assign({ [entry]: idx }, acc), {});
contract('ERC721', function (accounts) {
const [owner, newOwner, approved, anotherApproved, operator, other] = accounts;
const name = 'Non Fungible Token';
const symbol = 'NFT';
const firstTokenId = new BN('5042');
const secondTokenId = new BN('79217');
const nonExistentTokenId = new BN('13');
const RECEIVER_MAGIC_VALUE = '0x150b7a02';
beforeEach(async function () {
this.token = await ERC721Mock.new(name, symbol);
});
shouldSupportInterfaces([
'ERC165',
'ERC721',
'ERC721Enumerable',
'ERC721Metadata',
]);
describe('metadata', function () {
it('has a name', async function () {
expect(await this.token.name()).to.be.equal(name);
});
it('has a symbol', async function () {
expect(await this.token.symbol()).to.be.equal(symbol);
});
describe('token URI', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
});
const baseURI = 'https://api.com/v1/';
const sampleUri = 'mock://mytoken';
it('it is empty by default', async function () {
expect(await this.token.tokenURI(firstTokenId)).to.be.equal('');
});
it('reverts when queried for non existent token id', async function () {
await expectRevert(
this.token.tokenURI(nonExistentTokenId), 'ERC721Metadata: URI query for nonexistent token',
);
});
it('can be set for a token id', async function () {
await this.token.setTokenURI(firstTokenId, sampleUri);
expect(await this.token.tokenURI(firstTokenId)).to.be.equal(sampleUri);
});
it('reverts when setting for non existent token id', async function () {
await expectRevert(
this.token.setTokenURI(nonExistentTokenId, sampleUri), 'ERC721Metadata: URI set of nonexistent token',
);
});
it('base URI can be set', async function () {
await this.token.setBaseURI(baseURI);
expect(await this.token.baseURI()).to.equal(baseURI);
});
it('base URI is added as a prefix to the token URI', async function () {
await this.token.setBaseURI(baseURI);
await this.token.setTokenURI(firstTokenId, sampleUri);
expect(await this.token.tokenURI(firstTokenId)).to.be.equal(baseURI + sampleUri);
});
it('token URI can be changed by changing the base URI', async function () {
await this.token.setBaseURI(baseURI);
await this.token.setTokenURI(firstTokenId, sampleUri);
const newBaseURI = 'https://api.com/v2/';
await this.token.setBaseURI(newBaseURI);
expect(await this.token.tokenURI(firstTokenId)).to.be.equal(newBaseURI + sampleUri);
});
it('tokenId is appended to base URI for tokens with no URI', async function () {
await this.token.setBaseURI(baseURI);
expect(await this.token.tokenURI(firstTokenId)).to.be.equal(baseURI + firstTokenId);
});
it('tokens with URI can be burnt ', async function () {
await this.token.setTokenURI(firstTokenId, sampleUri);
await this.token.burn(firstTokenId, { from: owner });
expect(await this.token.exists(firstTokenId)).to.equal(false);
await expectRevert(
this.token.tokenURI(firstTokenId), 'ERC721Metadata: URI query for nonexistent token',
);
});
});
});
context('with minted tokens', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
await this.token.mint(owner, secondTokenId);
this.toWhom = other; // default to other for toWhom in context-dependent tests
});
describe('balanceOf', function () {
context('when the given address owns some tokens', function () {
it('returns the amount of tokens owned by the given address', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('2');
});
});
context('when the given address does not own any tokens', function () {
it('returns 0', async function () {
expect(await this.token.balanceOf(other)).to.be.bignumber.equal('0');
});
});
context('when querying the zero address', function () {
it('throws', async function () {
await expectRevert(
this.token.balanceOf(ZERO_ADDRESS), 'ERC721: balance query for the zero address',
);
});
});
});
describe('ownerOf', function () {
context('when the given token ID was tracked by this token', function () {
const tokenId = firstTokenId;
it('returns the owner of the given token ID', async function () {
expect(await this.token.ownerOf(tokenId)).to.be.equal(owner);
});
});
context('when the given token ID was not tracked by this token', function () {
const tokenId = nonExistentTokenId;
it('reverts', async function () {
await expectRevert(
this.token.ownerOf(tokenId), 'ERC721: owner query for nonexistent token',
);
});
});
});
describe('transfers', function () {
const tokenId = firstTokenId;
const data = '0x42';
let logs = null;
beforeEach(async function () {
await this.token.approve(approved, tokenId, { from: owner });
await this.token.setApprovalForAll(operator, true, { from: owner });
});
const transferWasSuccessful = function ({ owner, tokenId, approved }) {
it('transfers the ownership of the given token ID to the given address', async function () {
expect(await this.token.ownerOf(tokenId)).to.be.equal(this.toWhom);
});
it('emits a Transfer event', async function () {
expectEvent.inLogs(logs, 'Transfer', { from: owner, to: this.toWhom, tokenId: tokenId });
});
it('clears the approval for the token ID', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(ZERO_ADDRESS);
});
it('emits an Approval event', async function () {
expectEvent.inLogs(logs, 'Approval', { owner, approved: ZERO_ADDRESS, tokenId: tokenId });
});
it('adjusts owners balances', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('1');
});
it('adjusts owners tokens by index', async function () {
if (!this.token.tokenOfOwnerByIndex) return;
expect(await this.token.tokenOfOwnerByIndex(this.toWhom, 0)).to.be.bignumber.equal(tokenId);
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.not.equal(tokenId);
});
};
const shouldTransferTokensByUsers = function (transferFunction) {
context('when called by the owner', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: owner }));
});
transferWasSuccessful({ owner, tokenId, approved });
});
context('when called by the approved individual', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: approved }));
});
transferWasSuccessful({ owner, tokenId, approved });
});
context('when called by the operator', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: operator }));
});
transferWasSuccessful({ owner, tokenId, approved });
});
context('when called by the owner without an approved user', function () {
beforeEach(async function () {
await this.token.approve(ZERO_ADDRESS, tokenId, { from: owner });
({ logs } = await transferFunction.call(this, owner, this.toWhom, tokenId, { from: operator }));
});
transferWasSuccessful({ owner, tokenId, approved: null });
});
context('when sent to the owner', function () {
beforeEach(async function () {
({ logs } = await transferFunction.call(this, owner, owner, tokenId, { from: owner }));
});
it('keeps ownership of the token', async function () {
expect(await this.token.ownerOf(tokenId)).to.be.equal(owner);
});
it('clears the approval for the token ID', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(ZERO_ADDRESS);
});
it('emits only a transfer event', async function () {
expectEvent.inLogs(logs, 'Transfer', {
from: owner,
to: owner,
tokenId: tokenId,
});
});
it('keeps the owner balance', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('2');
});
it('keeps same tokens by index', async function () {
if (!this.token.tokenOfOwnerByIndex) return;
const tokensListed = await Promise.all(
[0, 1].map(i => this.token.tokenOfOwnerByIndex(owner, i)),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members(
[firstTokenId.toNumber(), secondTokenId.toNumber()],
);
});
});
context('when the address of the previous owner is incorrect', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, other, other, tokenId, { from: owner }),
'ERC721: transfer of token that is not own',
);
});
});
context('when the sender is not authorized for the token id', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, owner, other, tokenId, { from: other }),
'ERC721: transfer caller is not owner nor approved',
);
});
});
context('when the given token ID does not exist', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, owner, other, nonExistentTokenId, { from: owner }),
'ERC721: operator query for nonexistent token',
);
});
});
context('when the address to transfer the token to is the zero address', function () {
it('reverts', async function () {
await expectRevert(
transferFunction.call(this, owner, ZERO_ADDRESS, tokenId, { from: owner }),
'ERC721: transfer to the zero address',
);
});
});
};
describe('via transferFrom', function () {
shouldTransferTokensByUsers(function (from, to, tokenId, opts) {
return this.token.transferFrom(from, to, tokenId, opts);
});
});
describe('via safeTransferFrom', function () {
const safeTransferFromWithData = function (from, to, tokenId, opts) {
return this.token.methods['safeTransferFrom(address,address,uint256,bytes)'](from, to, tokenId, data, opts);
};
const safeTransferFromWithoutData = function (from, to, tokenId, opts) {
return this.token.methods['safeTransferFrom(address,address,uint256)'](from, to, tokenId, opts);
};
const shouldTransferSafely = function (transferFun, data) {
describe('to a user account', function () {
shouldTransferTokensByUsers(transferFun);
});
describe('to a valid receiver contract', function () {
beforeEach(async function () {
this.receiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.None);
this.toWhom = this.receiver.address;
});
shouldTransferTokensByUsers(transferFun);
it('calls onERC721Received', async function () {
const receipt = await transferFun.call(this, owner, this.receiver.address, tokenId, { from: owner });
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
operator: owner,
from: owner,
tokenId: tokenId,
data: data,
});
});
it('calls onERC721Received from approved', async function () {
const receipt = await transferFun.call(this, owner, this.receiver.address, tokenId, { from: approved });
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
operator: approved,
from: owner,
tokenId: tokenId,
data: data,
});
});
describe('with an invalid token id', function () {
it('reverts', async function () {
await expectRevert(
transferFun.call(
this,
owner,
this.receiver.address,
nonExistentTokenId,
{ from: owner },
),
'ERC721: operator query for nonexistent token',
);
});
});
});
};
describe('with data', function () {
shouldTransferSafely(safeTransferFromWithData, data);
});
describe('without data', function () {
shouldTransferSafely(safeTransferFromWithoutData, null);
});
describe('to a receiver contract returning unexpected value', function () {
it('reverts', async function () {
const invalidReceiver = await ERC721ReceiverMock.new('0x42', Error.None);
await expectRevert(
this.token.safeTransferFrom(owner, invalidReceiver.address, tokenId, { from: owner }),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
describe('to a receiver contract that reverts with message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithMessage);
await expectRevert(
this.token.safeTransferFrom(owner, revertingReceiver.address, tokenId, { from: owner }),
'ERC721ReceiverMock: reverting',
);
});
});
describe('to a receiver contract that reverts without message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithoutMessage);
await expectRevert(
this.token.safeTransferFrom(owner, revertingReceiver.address, tokenId, { from: owner }),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
describe('to a receiver contract that panics', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.Panic);
await expectRevert.unspecified(
this.token.safeTransferFrom(owner, revertingReceiver.address, tokenId, { from: owner }),
);
});
});
describe('to a contract that does not implement the required function', function () {
it('reverts', async function () {
const nonReceiver = this.token;
await expectRevert(
this.token.safeTransferFrom(owner, nonReceiver.address, tokenId, { from: owner }),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
});
});
describe('safe mint', function () {
const fourthTokenId = new BN(4);
const tokenId = fourthTokenId;
const data = '0x42';
describe('via safeMint', function () { // regular minting is tested in ERC721Mintable.test.js and others
it('calls onERC721Received — with data', async function () {
this.receiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.None);
const receipt = await this.token.safeMint(this.receiver.address, tokenId, data);
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
from: ZERO_ADDRESS,
tokenId: tokenId,
data: data,
});
});
it('calls onERC721Received — without data', async function () {
this.receiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.None);
const receipt = await this.token.safeMint(this.receiver.address, tokenId);
await expectEvent.inTransaction(receipt.tx, ERC721ReceiverMock, 'Received', {
from: ZERO_ADDRESS,
tokenId: tokenId,
});
});
context('to a receiver contract returning unexpected value', function () {
it('reverts', async function () {
const invalidReceiver = await ERC721ReceiverMock.new('0x42', Error.None);
await expectRevert(
this.token.safeMint(invalidReceiver.address, tokenId),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
context('to a receiver contract that reverts with message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithMessage);
await expectRevert(
this.token.safeMint(revertingReceiver.address, tokenId),
'ERC721ReceiverMock: reverting',
);
});
});
context('to a receiver contract that reverts without message', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.RevertWithoutMessage);
await expectRevert(
this.token.safeMint(revertingReceiver.address, tokenId),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
context('to a receiver contract that panics', function () {
it('reverts', async function () {
const revertingReceiver = await ERC721ReceiverMock.new(RECEIVER_MAGIC_VALUE, Error.Panic);
await expectRevert.unspecified(
this.token.safeMint(revertingReceiver.address, tokenId),
);
});
});
context('to a contract that does not implement the required function', function () {
it('reverts', async function () {
const nonReceiver = this.token;
await expectRevert(
this.token.safeMint(nonReceiver.address, tokenId),
'ERC721: transfer to non ERC721Receiver implementer',
);
});
});
});
});
describe('approve', function () {
const tokenId = firstTokenId;
let logs = null;
const itClearsApproval = function () {
it('clears approval for the token', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(ZERO_ADDRESS);
});
};
const itApproves = function (address) {
it('sets the approval for the target address', async function () {
expect(await this.token.getApproved(tokenId)).to.be.equal(address);
});
};
const itEmitsApprovalEvent = function (address) {
it('emits an approval event', async function () {
expectEvent.inLogs(logs, 'Approval', {
owner: owner,
approved: address,
tokenId: tokenId,
});
});
};
context('when clearing approval', function () {
context('when there was no prior approval', function () {
beforeEach(async function () {
({ logs } = await this.token.approve(ZERO_ADDRESS, tokenId, { from: owner }));
});
itClearsApproval();
itEmitsApprovalEvent(ZERO_ADDRESS);
});
context('when there was a prior approval', function () {
beforeEach(async function () {
await this.token.approve(approved, tokenId, { from: owner });
({ logs } = await this.token.approve(ZERO_ADDRESS, tokenId, { from: owner }));
});
itClearsApproval();
itEmitsApprovalEvent(ZERO_ADDRESS);
});
});
context('when approving a non-zero address', function () {
context('when there was no prior approval', function () {
beforeEach(async function () {
({ logs } = await this.token.approve(approved, tokenId, { from: owner }));
});
itApproves(approved);
itEmitsApprovalEvent(approved);
});
context('when there was a prior approval to the same address', function () {
beforeEach(async function () {
await this.token.approve(approved, tokenId, { from: owner });
({ logs } = await this.token.approve(approved, tokenId, { from: owner }));
});
itApproves(approved);
itEmitsApprovalEvent(approved);
});
context('when there was a prior approval to a different address', function () {
beforeEach(async function () {
await this.token.approve(anotherApproved, tokenId, { from: owner });
({ logs } = await this.token.approve(anotherApproved, tokenId, { from: owner }));
});
itApproves(anotherApproved);
itEmitsApprovalEvent(anotherApproved);
});
});
context('when the address that receives the approval is the owner', function () {
it('reverts', async function () {
await expectRevert(
this.token.approve(owner, tokenId, { from: owner }), 'ERC721: approval to current owner',
);
});
});
context('when the sender does not own the given token ID', function () {
it('reverts', async function () {
await expectRevert(this.token.approve(approved, tokenId, { from: other }),
'ERC721: approve caller is not owner nor approved');
});
});
context('when the sender is approved for the given token ID', function () {
it('reverts', async function () {
await this.token.approve(approved, tokenId, { from: owner });
await expectRevert(this.token.approve(anotherApproved, tokenId, { from: approved }),
'ERC721: approve caller is not owner nor approved for all');
});
});
context('when the sender is an operator', function () {
beforeEach(async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
({ logs } = await this.token.approve(approved, tokenId, { from: operator }));
});
itApproves(approved);
itEmitsApprovalEvent(approved);
});
context('when the given token ID does not exist', function () {
it('reverts', async function () {
await expectRevert(this.token.approve(approved, nonExistentTokenId, { from: operator }),
'ERC721: owner query for nonexistent token');
});
});
});
describe('setApprovalForAll', function () {
context('when the operator willing to approve is not the owner', function () {
context('when there is no operator approval set by the sender', function () {
it('approves the operator', async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(true);
});
it('emits an approval event', async function () {
const { logs } = await this.token.setApprovalForAll(operator, true, { from: owner });
expectEvent.inLogs(logs, 'ApprovalForAll', {
owner: owner,
operator: operator,
approved: true,
});
});
});
context('when the operator was set as not approved', function () {
beforeEach(async function () {
await this.token.setApprovalForAll(operator, false, { from: owner });
});
it('approves the operator', async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(true);
});
it('emits an approval event', async function () {
const { logs } = await this.token.setApprovalForAll(operator, true, { from: owner });
expectEvent.inLogs(logs, 'ApprovalForAll', {
owner: owner,
operator: operator,
approved: true,
});
});
it('can unset the operator approval', async function () {
await this.token.setApprovalForAll(operator, false, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(false);
});
});
context('when the operator was already approved', function () {
beforeEach(async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
});
it('keeps the approval to the given address', async function () {
await this.token.setApprovalForAll(operator, true, { from: owner });
expect(await this.token.isApprovedForAll(owner, operator)).to.equal(true);
});
it('emits an approval event', async function () {
const { logs } = await this.token.setApprovalForAll(operator, true, { from: owner });
expectEvent.inLogs(logs, 'ApprovalForAll', {
owner: owner,
operator: operator,
approved: true,
});
});
});
});
context('when the operator is the owner', function () {
it('reverts', async function () {
await expectRevert(this.token.setApprovalForAll(owner, true, { from: owner }),
'ERC721: approve to caller');
});
});
});
describe('getApproved', async function () {
context('when token is not minted', async function () {
it('reverts', async function () {
await expectRevert(
this.token.getApproved(nonExistentTokenId),
'ERC721: approved query for nonexistent token',
);
});
});
context('when token has been minted ', async function () {
it('should return the zero address', async function () {
expect(await this.token.getApproved(firstTokenId)).to.be.equal(
ZERO_ADDRESS,
);
});
context('when account has been approved', async function () {
beforeEach(async function () {
await this.token.approve(approved, firstTokenId, { from: owner });
});
it('returns approved account', async function () {
expect(await this.token.getApproved(firstTokenId)).to.be.equal(approved);
});
});
});
});
describe('totalSupply', function () {
it('returns total token supply', async function () {
expect(await this.token.totalSupply()).to.be.bignumber.equal('2');
});
});
describe('tokenOfOwnerByIndex', function () {
describe('when the given index is lower than the amount of tokens owned by the given address', function () {
it('returns the token ID placed at the given index', async function () {
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.equal(firstTokenId);
});
});
describe('when the index is greater than or equal to the total tokens owned by the given address', function () {
it('reverts', async function () {
await expectRevert(
this.token.tokenOfOwnerByIndex(owner, 2), 'EnumerableSet: index out of bounds',
);
});
});
describe('when the given address does not own any token', function () {
it('reverts', async function () {
await expectRevert(
this.token.tokenOfOwnerByIndex(other, 0), 'EnumerableSet: index out of bounds',
);
});
});
describe('after transferring all tokens to another user', function () {
beforeEach(async function () {
await this.token.transferFrom(owner, other, firstTokenId, { from: owner });
await this.token.transferFrom(owner, other, secondTokenId, { from: owner });
});
it('returns correct token IDs for target', async function () {
expect(await this.token.balanceOf(other)).to.be.bignumber.equal('2');
const tokensListed = await Promise.all(
[0, 1].map(i => this.token.tokenOfOwnerByIndex(other, i)),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members([firstTokenId.toNumber(),
secondTokenId.toNumber()]);
});
it('returns empty collection for original owner', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('0');
await expectRevert(
this.token.tokenOfOwnerByIndex(owner, 0), 'EnumerableSet: index out of bounds',
);
});
});
});
describe('tokenByIndex', function () {
it('returns all tokens', async function () {
const tokensListed = await Promise.all(
[0, 1].map(i => this.token.tokenByIndex(i)),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members([firstTokenId.toNumber(),
secondTokenId.toNumber()]);
});
it('reverts if index is greater than supply', async function () {
await expectRevert(
this.token.tokenByIndex(2), 'EnumerableSet: index out of bounds',
);
});
[firstTokenId, secondTokenId].forEach(function (tokenId) {
it(`returns all tokens after burning token ${tokenId} and minting new tokens`, async function () {
const newTokenId = new BN(300);
const anotherNewTokenId = new BN(400);
await this.token.burn(tokenId);
await this.token.mint(newOwner, newTokenId);
await this.token.mint(newOwner, anotherNewTokenId);
expect(await this.token.totalSupply()).to.be.bignumber.equal('3');
const tokensListed = await Promise.all(
[0, 1, 2].map(i => this.token.tokenByIndex(i)),
);
const expectedTokens = [firstTokenId, secondTokenId, newTokenId, anotherNewTokenId].filter(
x => (x !== tokenId),
);
expect(tokensListed.map(t => t.toNumber())).to.have.members(expectedTokens.map(t => t.toNumber()));
});
});
});
});
describe('_mint(address, uint256)', function () {
it('reverts with a null destination address', async function () {
await expectRevert(
this.token.mint(ZERO_ADDRESS, firstTokenId), 'ERC721: mint to the zero address',
);
});
context('with minted token', async function () {
beforeEach(async function () {
({ logs: this.logs } = await this.token.mint(owner, firstTokenId));
});
it('emits a Transfer event', function () {
expectEvent.inLogs(this.logs, 'Transfer', { from: ZERO_ADDRESS, to: owner, tokenId: firstTokenId });
});
it('creates the token', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('1');
expect(await this.token.ownerOf(firstTokenId)).to.equal(owner);
});
it('adjusts owner tokens by index', async function () {
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.equal(firstTokenId);
});
it('adjusts all tokens list', async function () {
expect(await this.token.tokenByIndex(0)).to.be.bignumber.equal(firstTokenId);
});
it('reverts when adding a token id that already exists', async function () {
await expectRevert(this.token.mint(owner, firstTokenId), 'ERC721: token already minted');
});
});
});
describe('_burn', function () {
it('reverts when burning a non-existent token id', async function () {
await expectRevert(
this.token.burn(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
context('with minted tokens', function () {
beforeEach(async function () {
await this.token.mint(owner, firstTokenId);
await this.token.mint(owner, secondTokenId);
});
context('with burnt token', function () {
beforeEach(async function () {
({ logs: this.logs } = await this.token.burn(firstTokenId));
});
it('emits a Transfer event', function () {
expectEvent.inLogs(this.logs, 'Transfer', { from: owner, to: ZERO_ADDRESS, tokenId: firstTokenId });
});
it('emits an Approval event', function () {
expectEvent.inLogs(this.logs, 'Approval', { owner, approved: ZERO_ADDRESS, tokenId: firstTokenId });
});
it('deletes the token', async function () {
expect(await this.token.balanceOf(owner)).to.be.bignumber.equal('1');
await expectRevert(
this.token.ownerOf(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
it('removes that token from the token list of the owner', async function () {
expect(await this.token.tokenOfOwnerByIndex(owner, 0)).to.be.bignumber.equal(secondTokenId);
});
it('adjusts all tokens list', async function () {
expect(await this.token.tokenByIndex(0)).to.be.bignumber.equal(secondTokenId);
});
it('burns all tokens', async function () {
await this.token.burn(secondTokenId, { from: owner });
expect(await this.token.totalSupply()).to.be.bignumber.equal('0');
await expectRevert(
this.token.tokenByIndex(0), 'EnumerableSet: index out of bounds',
);
});
it('reverts when burning a token id that has been deleted', async function () {
await expectRevert(
this.token.burn(firstTokenId), 'ERC721: owner query for nonexistent token',
);
});
});
});
});
shouldBehaveLikeERC721('ERC721', ...accounts);
shouldBehaveLikeERC721Metadata('ERC721', name, symbol, ...accounts);
});

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test/token/ERC721/ERC721Enumerable.test.js Normal file
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const {
shouldBehaveLikeERC721,
shouldBehaveLikeERC721Metadata,
shouldBehaveLikeERC721Enumerable,
} = require('./ERC721.behavior');
const ERC721Mock = artifacts.require('ERC721EnumerableMock');
contract('ERC721Enumerable', function (accounts) {
const name = 'Non Fungible Token';
const symbol = 'NFT';
beforeEach(async function () {
this.token = await ERC721Mock.new(name, symbol);
});
shouldBehaveLikeERC721('ERC721', ...accounts);
shouldBehaveLikeERC721Metadata('ERC721', name, symbol, ...accounts);
shouldBehaveLikeERC721Enumerable('ERC721', ...accounts);
});