openzeppelin-contracts/test/SimpleSavingsWallet.js

'use strict'
import expectThrow from './helpers/expectThrow';

const SimpleSavingsWallet = artifacts.require('../contracts/examples/SimpleSavingsWallet.sol')

contract('SimpleSavingsWallet', function(accounts) {
  let savingsWallet
  let owner

	const paymentAmount = 4242
 
  beforeEach(async function() {
    savingsWallet = await SimpleSavingsWallet.new(4141)
    owner = await savingsWallet.owner()
  })

	it('should receive funds', async function() {
		await web3.eth.sendTransaction({from: owner, to: savingsWallet.address, value: paymentAmount})    
    assert.isTrue(
    	(new web3.BigNumber(paymentAmount)).equals(web3.eth.getBalance(savingsWallet.address))
    )
  })

  it('owner can send funds', async function() {
  	// Receive payment so we have some money to spend.
		await web3.eth.sendTransaction({from: accounts[9], to: savingsWallet.address, value: 1000000})
    await expectThrow(savingsWallet.sendTo(0, paymentAmount, {from: owner}))
    await expectThrow(savingsWallet.sendTo(savingsWallet.address, paymentAmount, {from: owner}))
    await expectThrow(savingsWallet.sendTo(accounts[1], 0, {from: owner}))

    const balance = web3.eth.getBalance(accounts[1])
  	await savingsWallet.sendTo(accounts[1], paymentAmount, {from: owner})
  	assert.isTrue(balance.plus(paymentAmount).equals(web3.eth.getBalance(accounts[1])))
  })
})