Reorganize the repo structure (#2503)

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

test/utils/escrow/ConditionalEscrow.test.js

@@ -0,0 +1,36 @@
+const { ether, expectRevert } = require('@openzeppelin/test-helpers');
+const { shouldBehaveLikeEscrow } = require('./Escrow.behavior');
+
+const ConditionalEscrowMock = artifacts.require('ConditionalEscrowMock');
+
+contract('ConditionalEscrow', function (accounts) {
+  const [ owner, payee, ...otherAccounts ] = accounts;
+
+  beforeEach(async function () {
+    this.escrow = await ConditionalEscrowMock.new({ from: owner });
+  });
+
+  context('when withdrawal is allowed', function () {
+    beforeEach(async function () {
+      await Promise.all(otherAccounts.map(payee => this.escrow.setAllowed(payee, true)));
+    });
+
+    shouldBehaveLikeEscrow(owner, otherAccounts);
+  });
+
+  context('when withdrawal is disallowed', function () {
+    const amount = ether('23');
+
+    beforeEach(async function () {
+      await this.escrow.setAllowed(payee, false);
+    });
+
+    it('reverts on withdrawals', async function () {
+      await this.escrow.deposit(payee, { from: owner, value: amount });
+
+      await expectRevert(this.escrow.withdraw(payee, { from: owner }),
+        'ConditionalEscrow: payee is not allowed to withdraw',
+      );
+    });
+  });
+});