Add complex crowdsale example OpenZeppelin#331 requested changes

contracts/examples/SampleCrowdsale.sol

@@ -0,0 +1,48 @@
+pragma solidity ^0.4.11;
+
+import "../crowdsale/CappedCrowdsale.sol";
+import "../crowdsale/RefundableCrowdsale.sol";
+import "../token/MintableToken.sol";
+
+/**
+ * @title SampleCrowdsaleToken
+ * @dev Very simple ERC20 Token that can be minted.
+ * It is meant to be used in a crowdsale contract.
+ */
+contract SampleCrowdsaleToken is MintableToken {
+
+  string public constant name = "Sample Crowdsale Token";
+  string public constant symbol = "SCT";
+  uint8 public constant decimals = 18;
+
+}
+
+/**
+ * @title SampleCrowdsale
+ * @dev This is an example of a fully fledged crowdsale.
+ * The way to add new features to a base crowdsale is by multiple inheritance.
+ * In this example we are providing following extensions:
+ * CappedCrowdsale - sets a max boundary for raised funds
+ * RefundableCrowdsale - set a min goal to be reached and returns funds if it's not met
+ *
+ * After adding multiple features it's good practice to run integration tests
+ * to ensure that subcontracts works together as intended.
+ */
+contract SampleCrowdsale is CappedCrowdsale, RefundableCrowdsale {
+
+  function SampleCrowdsale(uint256 _startBlock, uint256 _endBlock, uint256 _rate, uint256 _goal, uint256 _cap, address _wallet)
+    CappedCrowdsale(_cap)
+    FinalizableCrowdsale()
+    RefundableCrowdsale(_goal)
+    Crowdsale(_startBlock, _endBlock, _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
+    require(_goal <= _cap);
+  }
+
+  function createTokenContract() internal returns (MintableToken) {
+    return new SampleCrowdsaleToken();
+  }
+
+}

test/SampleCrowdsale.js

@@ -34,7 +34,7 @@ contract('Crowdsale', function ([owner, wallet, investor]) {
     (await this.crowdsale.startBlock()).should.be.bignumber.equal(this.startBlock);
     (await this.crowdsale.endBlock()).should.be.bignumber.equal(this.endBlock);
     (await this.crowdsale.rate()).should.be.bignumber.equal(RATE);
-    (await this.crowdsale.wallet()).should.be.bignumber.equal(wallet);
+    (await this.crowdsale.wallet()).should.be.equal(wallet);
     (await this.crowdsale.goal()).should.be.bignumber.equal(GOAL);
     (await this.crowdsale.cap()).should.be.bignumber.equal(CAP);
   });