ERC1155 feature pending tasks (#2014)

* Initial ERC1155 implementation with some tests (#1803)

* Initial ERC1155 implementation with some tests

* Remove mocked isERC1155TokenReceiver

* Revert reason edit nit

* Remove parameters associated with isERC1155TokenReceiver call

* Add tests for approvals and single transfers

* Add tests for transferring to contracts

* Add tests for batch transfers

* Make expectEvent.inTransaction tests async

* Renamed "owner" to "account" and "holder"

* Document unspecified balanceOfBatch reversion on zero behavior

* Ensure accounts can't set their own operator status

* Specify descriptive messages for underflow errors

* Bring SafeMath.add calls in line with OZ style

* Explicitly prevent _burn on the zero account

* Implement batch minting/burning

* Refactored operator approval check into isApprovedForAll calls

* Renamed ERC1155TokenReceiver to ERC1155Receiver

* Added ERC1155Holder

* Fix lint issues

* Migrate tests to @openzeppelin/test-environment

* Port ERC 1155 branch to Solidity 0.6 (and current master) (#2130)

* port ERC1155 to Solidity 0.6

* make ERC1155 constructor more similar to ERC721 one

* also migrate mock contracts to Solidity 0.6

* mark all non-view functions as virtual

Co-authored-by: Alan Lu <alanlu1023@gmail.com>
Co-authored-by: Nicolás Venturo <nicolas.venturo@gmail.com>
Co-authored-by: Robert Kaiser <kairo@kairo.at>

test/token/ERC1155/ERC1155Holder.test.js

@@ -0,0 +1,46 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+const { BN } = require('@openzeppelin/test-helpers');
+
+const ERC1155Holder = contract.fromArtifact('ERC1155Holder');
+const ERC1155Mock = contract.fromArtifact('ERC1155Mock');
+
+const { expect } = require('chai');
+
+describe('ERC1155Holder', function () {
+  const [creator] = accounts;
+
+  it('receives ERC1155 tokens', async function () {
+    const multiToken = await ERC1155Mock.new({ from: creator });
+    const multiTokenIds = [new BN(1), new BN(2), new BN(3)];
+    const multiTokenAmounts = [new BN(1000), new BN(2000), new BN(3000)];
+    await multiToken.mintBatch(creator, multiTokenIds, multiTokenAmounts, '0x', { from: creator });
+
+    const transferData = '0xf00dbabe';
+
+    const holder = await ERC1155Holder.new();
+
+    await multiToken.safeTransferFrom(
+      creator,
+      holder.address,
+      multiTokenIds[0],
+      multiTokenAmounts[0],
+      transferData,
+      { from: creator },
+    );
+
+    expect(await multiToken.balanceOf(holder.address, multiTokenIds[0])).to.be.bignumber.equal(multiTokenAmounts[0]);
+
+    await multiToken.safeBatchTransferFrom(
+      creator,
+      holder.address,
+      multiTokenIds.slice(1),
+      multiTokenAmounts.slice(1),
+      transferData,
+      { from: creator },
+    );
+
+    for (let i = 1; i < multiTokenIds.length; i++) {
+      expect(await multiToken.balanceOf(holder.address, multiTokenIds[i])).to.be.bignumber.equal(multiTokenAmounts[i]);
+    }
+  });
+});