SplitPayment now requires payees. (#1131)

* SplitPayment now requires payees.

* Improved test phrasing.

contracts/payment/SplitPayment.sol

@@ -23,6 +23,7 @@ contract SplitPayment {
    */
   constructor(address[] _payees, uint256[] _shares) public payable {
     require(_payees.length == _shares.length);
+    require(_payees.length > 0);
 
     for (uint256 i = 0; i < _payees.length; i++) {
       addPayee(_payees[i], _shares[i]);

test/payment/SplitPayment.test.js

@@ -13,6 +13,19 @@ const SplitPayment = artifacts.require('SplitPayment');
 contract('SplitPayment', function ([_, owner, payee1, payee2, payee3, nonpayee1, payer1]) {
   const amount = web3.toWei(1.0, 'ether');
 
+  it('cannot be created with no payees', async function () {
+    await expectThrow(SplitPayment.new([], []), EVMThrow);
+  });
+
+  it('requires shares for each payee', async function () {
+    await expectThrow(SplitPayment.new([payee1, payee2, payee3], [20, 30]), EVMThrow);
+  });
+
+  it('requires a payee for each share', async function () {
+    await expectThrow(SplitPayment.new([payee1, payee2], [20, 30, 40]), EVMThrow);
+  });
+
+  context('once deployed', function () {
     beforeEach(async function () {
       this.payees = [payee1, payee2, payee3];
       this.shares = [20, 10, 70];
@@ -78,3 +91,4 @@ contract('SplitPayment', function ([_, owner, payee1, payee2, payee3, nonpayee1,
       totalReleased.should.be.bignumber.equal(initBalance);
     });
   });
+});