shuffle outputs

lib/model/txproposal.js

@@ -32,6 +32,7 @@ TxProposal.create = function(opts) {
   x.requiredRejections = opts.requiredRejections;
   x.status = 'pending';
   x.actions = [];
+  x.outputOrder = _.shuffle(_.range(2));
 
   return x;
 };
@@ -58,6 +59,7 @@ TxProposal.fromObj = function(obj) {
   x.actions = _.map(obj.actions, function(action) {
     return TxProposalAction.fromObj(action);
   });
+  x.outputOrder = obj.outputOrder;
 
   return x;
 };

test/models/txproposal.js

@@ -22,6 +22,17 @@ describe('TXProposal', function() {
       var t = txp.getBitcoreTx();
       should.exist(t);
     });
+    it('should order ouputs as specified by outputOrder', function() {
+      var txp = TXP.fromObj(aTXP());
+
+      txp.outputOrder = [0, 1];
+      var t = txp._getBitcoreTx();
+      t.getChangeOutput().should.deep.equal(t.outputs[1]);
+
+      txp.outputOrder = [1, 0];
+      var t = txp._getBitcoreTx();
+      t.getChangeOutput().should.deep.equal(t.outputs[0]);
+    });
   });
 
 
@@ -108,6 +119,7 @@ var aTXP = function() {
     "requiredSignatures": 2,
     "requiredRejections": 1,
     "status": "pending",
-    "actions": []
+    "actions": [],
+    "outputOrder": [0, 1],
   }
 };