var assert = require(“../assert”);

module.exports = {

"on a new transition": {
  topic: function(d3) {
    var cb = this.callback,
        t = d3.select("body").append("div").transition().remove();
    t.each("end", function() { cb(null, t); });
  },
  "removes the selected elements": function(transition) {
    assert.domEqual(transition[0][0].parentNode, null);
  }
},

"when the element is already removed": {
  topic: function(d3) {
    var cb = this.callback,
        t = d3.select("body").append("div").remove().transition().remove();
    t.each("end", function() { cb(null, t); });
  },
  "does nothing": function(transition) {
    assert.domEqual(transition[0][0].parentNode, null);
  }
},

// Since these tests are triggered inside the end event of the above topic,
// transitions will inherit ids from the original transition. But we want to
// test concurrent transitions, so we use timeouts to avoid inheritance. This
// test also verifies that if multiple transitions are created at the same
// time, the last transition becomes the owner.

"when another transition is scheduled": {
  topic: function(d3) {
    var cb = this.callback,
        s = d3.select("body").append("div");
    setTimeout(function() {
      s.transition().duration(150).remove().each("end", function() { cb(null, s); });
      s.transition().delay(250);
    }, 10);
  },
  "does nothing": function(selection) {
    assert.equal(selection[0][0].parentNode.tagName, "BODY");
  }
}

};