Change crowdsales to use timestamps instead of block numbers #350 update example

contracts/examples/SampleCrowdsale.sol

@@ -30,11 +30,11 @@ contract SampleCrowdsaleToken is MintableToken {
  */
 contract SampleCrowdsale is CappedCrowdsale, RefundableCrowdsale {
 
-  function SampleCrowdsale(uint256 _startBlock, uint256 _endBlock, uint256 _rate, uint256 _goal, uint256 _cap, address _wallet)
+  function SampleCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, uint256 _goal, uint256 _cap, address _wallet)
     CappedCrowdsale(_cap)
     FinalizableCrowdsale()
     RefundableCrowdsale(_goal)
-    Crowdsale(_startBlock, _endBlock, _rate, _wallet)
+    Crowdsale(_startTime, _endTime, _rate, _wallet)
   {
     //As goal needs to be met for a successful crowdsale
     //the value needs to less or equal than a cap which is limit for accepted funds

test/SampleCrowdsale.js

+import moment from 'moment'
 import ether from './helpers/ether'
 import advanceToBlock from './helpers/advanceToBlock'
+import increaseTime from './helpers/increaseTime'
+import latestTime from './helpers/latestTime'
 import EVMThrow from './helpers/EVMThrow'
 
 const BigNumber = web3.BigNumber;
@@ -18,11 +21,17 @@ contract('Crowdsale', function ([owner, wallet, investor]) {
   const GOAL = ether(10);
   const CAP  = ether(20);
 
+  before(async function() {
+    //Advance to the next block to correctly read time in the solidity "now" function interpreted by testrpc
+    await advanceToBlock(web3.eth.getBlock('latest').number + 1)
+  })
+
   beforeEach(async function () {
-    this.startBlock = web3.eth.blockNumber + 10;
-    this.endBlock =   web3.eth.blockNumber + 20;
+    this.startTime = latestTime().unix() + moment.duration(1, 'week').asSeconds();
+    this.endTime =   latestTime().unix() + moment.duration(2, 'week').asSeconds();
+
 
-    this.crowdsale = await SampleCrowdsale.new(this.startBlock, this.endBlock, RATE, GOAL, CAP, wallet);
+    this.crowdsale = await SampleCrowdsale.new(this.startTime, this.endTime, RATE, GOAL, CAP, wallet);
     this.token = SampleCrowdsaleToken.at(await this.crowdsale.token());
   });
 
@@ -31,8 +40,8 @@ contract('Crowdsale', function ([owner, wallet, investor]) {
     this.crowdsale.should.exist;
     this.token.should.exist;
 
-    (await this.crowdsale.startBlock()).should.be.bignumber.equal(this.startBlock);
-    (await this.crowdsale.endBlock()).should.be.bignumber.equal(this.endBlock);
+    (await this.crowdsale.startTime()).should.be.bignumber.equal(this.startTime);
+    (await this.crowdsale.endTime()).should.be.bignumber.equal(this.endTime);
     (await this.crowdsale.rate()).should.be.bignumber.equal(RATE);
     (await this.crowdsale.wallet()).should.be.equal(wallet);
     (await this.crowdsale.goal()).should.be.bignumber.equal(GOAL);
@@ -48,7 +57,7 @@ contract('Crowdsale', function ([owner, wallet, investor]) {
     const investmentAmount = ether(1);
     const expectedTokenAmount = RATE.mul(investmentAmount);
 
-    await advanceToBlock(this.startBlock - 1);
+    await increaseTime(moment.duration(1, 'week'));
     await this.crowdsale.buyTokens(investor, {value: investmentAmount, from: investor}).should.be.fulfilled;
 
     (await this.token.balanceOf(investor)).should.be.bignumber.equal(expectedTokenAmount);
@@ -56,22 +65,23 @@ contract('Crowdsale', function ([owner, wallet, investor]) {
   });
 
   it('should reject payments after end', async function () {
-    await advanceToBlock(this.endBlock);
+    await increaseTime(moment.duration(2.1, 'week'));
     await this.crowdsale.send(ether(1)).should.be.rejectedWith(EVMThrow);
     await this.crowdsale.buyTokens(investor, {value: ether(1), from: investor}).should.be.rejectedWith(EVMThrow);
   });
 
   it('should reject payments over cap', async function () {
-    await advanceToBlock(this.startBlock - 1);
+    await increaseTime(moment.duration(1, 'week'));
     await this.crowdsale.send(CAP);
     await this.crowdsale.send(1).should.be.rejectedWith(EVMThrow);
   });
 
   it('should allow finalization and transfer funds to wallet if the goal is reached', async function () {
-    await advanceToBlock(this.endBlock - 1);
+    await increaseTime(moment.duration(1, 'week'));
     await this.crowdsale.send(GOAL);
 
     const beforeFinalization = web3.eth.getBalance(wallet);
+    await increaseTime(moment.duration(1.1, 'week'));
     await this.crowdsale.finalize({from: owner});
     const afterFinalization = web3.eth.getBalance(wallet);
 
@@ -81,9 +91,9 @@ contract('Crowdsale', function ([owner, wallet, investor]) {
   it('should allow refunds if the goal is not reached', async function () {
     const balanceBeforeInvestment = web3.eth.getBalance(investor);
 
-    await advanceToBlock(this.startBlock - 1);
+    await increaseTime(moment.duration(1, 'week'));
     await this.crowdsale.sendTransaction({value: ether(1), from: investor, gasPrice: 0});
-    await advanceToBlock(this.endBlock);
+    await increaseTime(moment.duration(1.1, 'week'));
 
     await this.crowdsale.finalize({from: owner});
     await this.crowdsale.claimRefund({from: investor, gasPrice: 0}).should.be.fulfilled;