here

gistfile1.js

  test("#1664 - silent changes on changing attributes triggered by other attributes", 1, function() {
    var changes = [];
    var model = new Backbone.Model({a:'a', b:1, c:'item'});
    model.on('change:a change:b change:c', function(model, val) { changes.push(val); });
    model.on('change', function() {
      model.set({a:'c'}, {silent:true});
    });
    model.change();
    model.set({a:'a'}, {silent:true});
    model.change();
    deepEqual(changes, []);
  });