var assert = require(“../assert”);

module.exports = {

"with a single element selected": {
  topic: function(d3) {
    return d3.select("body").transition();
  },
  "returns zero for empty subselections": function(body) {
    assert.equal(body.select("foo").size(), 0);
  },
  "returns one for a singleton selection": function(body) {
    assert.equal(body.size(), 1);
  },
  "does not count null nodes": function(body) {
    body[0][0] = null;
    assert.equal(body.size(), 0);
  }
},
"with multiple elements selected": {
  topic: function(d3) {
    var body = d3.select("body").html(null);
    body.append("div").append("span");
    body.append("div");
    return body.selectAll("div").transition();
  },
  "returns null for empty selections": function(div) {
    assert.equal(div.select("foo").size(), 0);
  },
  "returns the number of non-null nodes": function(div) {
    assert.equal(div.size(), 2);
  },
  "does not count null nodes": function(div) {
    div[0][0] = null;
    assert.equal(div.size(), 1);
  }
}

};