Add utilities for CrossChain messaging (#3183)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

test/access/AccessControlCrossChain.test.js

@@ -0,0 +1,59 @@
+const { expectRevert } = require('@openzeppelin/test-helpers');
+const { BridgeHelper } = require('../helpers/crosschain');
+
+const {
+  shouldBehaveLikeAccessControl,
+} = require('./AccessControl.behavior.js');
+
+const crossChainRoleAlias = (role) => web3.utils.leftPad(
+  web3.utils.toHex(web3.utils.toBN(role).xor(web3.utils.toBN(web3.utils.soliditySha3('CROSSCHAIN_ALIAS')))),
+  64,
+);
+
+const AccessControlCrossChainMock = artifacts.require('AccessControlCrossChainMock');
+
+const ROLE = web3.utils.soliditySha3('ROLE');
+
+contract('AccessControl', function (accounts) {
+  before(async function () {
+    this.bridge = await BridgeHelper.deploy();
+  });
+
+  beforeEach(async function () {
+    this.accessControl = await AccessControlCrossChainMock.new({ from: accounts[0] });
+  });
+
+  shouldBehaveLikeAccessControl('AccessControl', ...accounts);
+
+  describe('CrossChain enabled', function () {
+    beforeEach(async function () {
+      await this.accessControl.grantRole(ROLE, accounts[0], { from: accounts[0] });
+      await this.accessControl.grantRole(crossChainRoleAlias(ROLE), accounts[1], { from: accounts[0] });
+    });
+
+    it('check alliassing', async function () {
+      expect(await this.accessControl.crossChainRoleAlias(ROLE)).to.be.bignumber.equal(crossChainRoleAlias(ROLE));
+    });
+
+    it('Crosschain calls not authorized to non-aliased addresses', async function () {
+      await expectRevert(
+        this.bridge.call(
+          accounts[0],
+          this.accessControl,
+          'senderProtected',
+          [ ROLE ],
+        ),
+        `AccessControl: account ${accounts[0].toLowerCase()} is missing role ${crossChainRoleAlias(ROLE)}`,
+      );
+    });
+
+    it('Crosschain calls not authorized to non-aliased addresses', async function () {
+      await this.bridge.call(
+        accounts[1],
+        this.accessControl,
+        'senderProtected',
+        [ ROLE ],
+      );
+    });
+  });
+});