Implement Non Fungible Token Royalty (EIP2981) (#3012)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

test/token/ERC721/extensions/ERC721Royalty.test.js

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+const { BN, constants } = require('@openzeppelin/test-helpers');
+const ERC721RoyaltyMock = artifacts.require('ERC721RoyaltyMock');
+const { ZERO_ADDRESS } = constants;
+
+const { shouldBehaveLikeERC2981 } = require('../../common/ERC2981.behavior');
+
+contract('ERC721Royalty', function (accounts) {
+  const [ account1, account2 ] = accounts;
+  const tokenId1 = new BN('1');
+  const tokenId2 = new BN('2');
+  const royalty = new BN('200');
+  const salePrice = new BN('1000');
+
+  beforeEach(async function () {
+    this.token = await ERC721RoyaltyMock.new('My Token', 'TKN');
+
+    await this.token.mint(account1, tokenId1);
+    await this.token.mint(account1, tokenId2);
+    this.account1 = account1;
+    this.account2 = account2;
+    this.tokenId1 = tokenId1;
+    this.tokenId2 = tokenId2;
+    this.salePrice = salePrice;
+  });
+
+  describe('token specific functions', function () {
+    beforeEach(async function () {
+      await this.token.setTokenRoyalty(tokenId1, account1, royalty);
+    });
+
+    it('removes royalty information after burn', async function () {
+      await this.token.burn(tokenId1);
+      const tokenInfo = await this.token.royaltyInfo(tokenId1, salePrice);
+
+      expect(tokenInfo[0]).to.be.equal(ZERO_ADDRESS);
+      expect(tokenInfo[1]).to.be.bignumber.equal(new BN('0'));
+    });
+  });
+  shouldBehaveLikeERC2981();
+});