Reorganize the repo structure (#2503)

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

test/security/PullPayment.test.js

@@ -0,0 +1,51 @@
+const { balance, ether } = require('@openzeppelin/test-helpers');
+
+const { expect } = require('chai');
+
+const PullPaymentMock = artifacts.require('PullPaymentMock');
+
+contract('PullPayment', function (accounts) {
+  const [ payer, payee1, payee2 ] = accounts;
+
+  const amount = ether('17');
+
+  beforeEach(async function () {
+    this.contract = await PullPaymentMock.new({ value: amount });
+  });
+
+  describe('payments', function () {
+    it('can record an async payment correctly', async function () {
+      await this.contract.callTransfer(payee1, 100, { from: payer });
+      expect(await this.contract.payments(payee1)).to.be.bignumber.equal('100');
+    });
+
+    it('can add multiple balances on one account', async function () {
+      await this.contract.callTransfer(payee1, 200, { from: payer });
+      await this.contract.callTransfer(payee1, 300, { from: payer });
+      expect(await this.contract.payments(payee1)).to.be.bignumber.equal('500');
+    });
+
+    it('can add balances on multiple accounts', async function () {
+      await this.contract.callTransfer(payee1, 200, { from: payer });
+      await this.contract.callTransfer(payee2, 300, { from: payer });
+
+      expect(await this.contract.payments(payee1)).to.be.bignumber.equal('200');
+
+      expect(await this.contract.payments(payee2)).to.be.bignumber.equal('300');
+    });
+  });
+
+  describe('withdrawPayments', function () {
+    it('can withdraw payment', async function () {
+      const balanceTracker = await balance.tracker(payee1);
+
+      await this.contract.callTransfer(payee1, amount, { from: payer });
+      expect(await this.contract.payments(payee1)).to.be.bignumber.equal(amount);
+
+      await this.contract.withdrawPayments(payee1);
+
+      expect(await balanceTracker.delta()).to.be.bignumber.equal(amount);
+      expect(await this.contract.payments(payee1)).to.be.bignumber.equal('0');
+    });
+  });
+});