sanity check for CappedCrowdsale: cap > 0

contracts/crowdsale/CappedCrowdsale.sol

@@ -13,6 +13,7 @@ contract CappedCrowdsale is Crowdsale {
   uint256 public cap;
 
   function CappedCrowdsale(uint256 _cap) {
+    require(_cap > 0);
     cap = _cap;
   }
 

test/CappedCrowdsale.js

@@ -19,6 +19,15 @@ contract('CappedCrowdsale', function ([_, wallet]) {
   const cap = ether(300)
   const lessThanCap = ether(60)
 
+  describe('creating a valid crowdsale', function () {
+
+    it('should fail with zero cap', async function () {
+      await CappedCrowdsale.new(this.startBlock, this.endBlock, rate, wallet, 0).should.be.rejectedWith(EVMThrow);
+    })
+
+  });
+
+
   beforeEach(async function () {
     this.startBlock = web3.eth.blockNumber + 10
     this.endBlock =   web3.eth.blockNumber + 20