var assert = require(“../assert”);

module.exports = {

topic: function(d3) {
  return d3; // bug in vows where topic is not propagated automatically
},
"on a new transition": {
  topic: function(d3) {
    return d3.select("body").append("div").transition();
  },
  "has a positive integer id": function(transition) {
    var id = transition.id;
    assert.isTrue(id > 0);
    assert.equal(~~id, id);
  }
},
"increases monotonically across transitions": function(d3) {
  var t0 = d3.select("body").append("div").transition(),
      t1 = d3.select("body").append("div").transition();
  assert.isTrue(t1.id > t0.id);
}

};