var vows = require(“vows”),

load = require("../load"),
assert = require("../assert");

var suite = vows.describe(“selection.node”);

suite.addBatch({

"select(body)": {
  topic: load("selection/node").document(),
  "on a simple page": {
    topic: function(d3) {
      return d3.select("body");
    },
    "returns null for empty selections": function(body) {
      assert.isNull(body.select("foo").node());
    },
    "returns the first element for non-empty selections": function(body) {
      assert.isTrue(body.node() === body[0][0]);
      assert.equal(body.node().tagName, "BODY");
    },
    "ignores null nodes": function(body) {
      body[0][0] = null;
      assert.isNull(body.node());
    }
  }
}

});

suite.addBatch({

"selectAll(div)": {
  topic: load("selection/node").document(),
  "on a simple page": {
    topic: function(d3) {
      var body = d3.select("body");
      body.append("div").append("span");
      body.append("div");
      return body.selectAll("div");
    },
    "returns null for empty selections": function(div) {
      assert.isNull(div.select("foo").node());
    },
    "returns the first element for non-empty selections": function(div) {
      assert.isTrue(div.node() === div[0][0]);
      assert.equal(div.node().tagName, "DIV");
    },
    "ignores null nodes": function(div) {
      div[0][0] = null;
      assert.isTrue(div.node() === div[0][1]);
      assert.equal(div.node().tagName, "DIV");
    }
  }
}

});

suite.export(module);