add a TokenTimelock contract

test/TokenTimelock.js

@@ -0,0 +1,58 @@
+const BigNumber = web3.BigNumber
+
+require('chai')
+  .use(require('chai-as-promised'))
+  .use(require('chai-bignumber')(BigNumber))
+  .should()
+
+import moment from 'moment'
+
+import latestTime from './helpers/latestTime'
+import increaseTime from './helpers/increaseTime'
+
+const MintableToken = artifacts.require('MintableToken')
+const TokenTimelock = artifacts.require('TokenTimelock')
+
+contract('TokenTimelock', function ([_, owner, beneficiary]) {
+
+  const amount = new BigNumber(100)
+
+  beforeEach(async function () {
+    this.token = await MintableToken.new({from: owner})
+    this.releaseTime = latestTime().add(1, 'year').unix()
+    this.timelock = await TokenTimelock.new(this.token.address, beneficiary, this.releaseTime)
+    await this.token.mint(this.timelock.address, amount, {from: owner})
+  })
+
+  it('cannot be claimed before time limit', async function () {
+    await this.timelock.claim({from: beneficiary}).should.be.rejected
+  })
+
+  it('cannot be claimed just before time limit', async function () {
+    await increaseTime(moment.duration(0.99, 'year'))
+    await this.timelock.claim({from: beneficiary}).should.be.rejected
+  })
+
+  it('can be claimed just after limit', async function () {
+    await increaseTime(moment.duration(1.01, 'year'))
+    await this.timelock.claim({from: beneficiary}).should.be.fulfilled
+    const balance = await this.token.balanceOf(beneficiary)
+    balance.should.be.bignumber.equal(amount)
+  })
+
+  it('can be claimed after time limit', async function () {
+    await increaseTime(moment.duration(2, 'year'))
+    await this.timelock.claim({from: beneficiary}).should.be.fulfilled
+    const balance = await this.token.balanceOf(beneficiary)
+    balance.should.be.bignumber.equal(amount)
+  })
+
+  it('cannot be claimed twice', async function () {
+    await increaseTime(moment.duration(2, 'year'))
+    await this.timelock.claim({from: beneficiary}).should.be.fulfilled
+    await this.timelock.claim({from: beneficiary}).should.be.rejected
+    const balance = await this.token.balanceOf(beneficiary)
+    balance.should.be.bignumber.equal(amount)
+  })
+
+})