fix: make SplitPayment payable by default

contracts/payment/SplitPayment.sol

@@ -20,7 +20,7 @@ contract SplitPayment {
   /**
    * @dev Constructor
    */
-  function SplitPayment(address[] _payees, uint256[] _shares) public {
+  function SplitPayment(address[] _payees, uint256[] _shares) public payable {
     require(_payees.length == _shares.length);
 
     for (uint256 i = 0; i < _payees.length; i++) {
@@ -62,4 +62,9 @@ contract SplitPayment {
 
     payee.transfer(payment);
   }
+
+  /**
+   * @dev payable fallback
+   */
+  function () public payable {}
 }

test/SplitPayment.js

@@ -6,7 +6,7 @@ const should = require('chai')
   .should()
 
 const EVMThrow = require('./helpers/EVMThrow.js')
-const SplitPaymentMock = artifacts.require('./helpers/SplitPaymentMock.sol')
+const SplitPayment = artifacts.require('../contracts/payment/SplitPayment.sol')
 
 contract('SplitPayment', function ([owner, payee1, payee2, payee3, nonpayee1, payer1]) {
   const amount = web3.toWei(1.0, 'ether')
@@ -15,7 +15,7 @@ contract('SplitPayment', function ([owner, payee1, payee2, payee3, nonpayee1, pa
     this.payees = [payee1, payee2, payee3]
     this.shares = [20, 10, 70]
 
-    this.contract = await SplitPaymentMock.new(this.payees, this.shares)
+    this.contract = await SplitPayment.new(this.payees, this.shares)
   })
 
   it('should accept payments', async function () {

test/helpers/SplitPaymentMock.sol

-pragma solidity ^0.4.18;
-
-import '../../contracts/payment/SplitPayment.sol';
-
-// mock class using SplitPayment
-contract SplitPaymentMock is SplitPayment {
-  function SplitPaymentMock(address[] _payees, uint256[] _shares) public
-    SplitPayment(_payees, _shares) payable {}
-  function () external payable {}
-}