text: require("../env");
  require("../../d3");
  
  var vows = require("vows"),
      assert = require("assert");
  
  var suite = vows.describe("selection.append");
  
  suite.addBatch({
    "select(body)": {
      topic: function() {
        return d3.select("body").html("");
      },
      "appends an HTML element": function(body) {
        var div = body.append("div");
        assert.equal(div[0][0].tagName, "DIV");
        assert.isNull(div[0][0].namespaceURI);
        assert.isTrue(div[0][0].parentNode === document.body);
        assert.isTrue(div[0][0] === document.body.lastChild);
      },
      "appends an SVG element": function(body) {
        var svg = body.append("svg:svg");
        assert.equal(svg[0][0].tagName, "SVG");
        assert.equal(svg[0][0].namespaceURI, "http://www.w3.org/2000/svg");
        assert.isTrue(svg[0][0].parentNode === document.body);
        assert.isTrue(svg[0][0] === document.body.lastChild);
      },
      "propagates data to new element": function(body) {
        var data = new Object(), div = body.data([data]).append("div");
        assert.strictEqual(div[0][0].__data__, data);
      },
      "returns a new selection": function(body) {
        assert.isFalse(body.append("div") === body);
      }
    }
  });
  
  suite.addBatch({
    "selectAll(div)": {
      topic: function() {
        return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");
      },
      "appends an HTML element": function(div) {
        var span = div.append("span");
        assert.equal(span[0].length, 2);
        assert.equal(span[0][0].tagName, "SPAN");
        assert.equal(span[0][1].tagName, "SPAN");
        assert.isNull(span[0][0].namespaceURI);
        assert.isNull(span[0][1].namespaceURI);
        assert.isTrue(span[0][0].parentNode === div[0][0]);
        assert.isTrue(span[0][1].parentNode === div[0][1]);
        assert.isTrue(div[0][0].lastChild === span[0][0]);
        assert.isTrue(div[0][1].lastChild === span[0][1]);
      },
      "appends an SVG element": function(div) {
        var svg = div.append("svg:svg");
        assert.equal(svg[0].length, 2);
        assert.equal(svg[0][0].tagName, "SVG");
        assert.equal(svg[0][1].tagName, "SVG");
        assert.equal(svg[0][0].namespaceURI, "http://www.w3.org/2000/svg");
        assert.equal(svg[0][1].namespaceURI, "http://www.w3.org/2000/svg");
        assert.isTrue(svg[0][0].parentNode === div[0][0]);
        assert.isTrue(svg[0][1].parentNode === div[0][1]);
        assert.isTrue(div[0][0].lastChild === svg[0][0]);
        assert.isTrue(div[0][1].lastChild === svg[0][1]);
      },
      "ignores null nodes": function(div) {
        div.html("");
        var some = d3.selectAll("div");
        some[0][1] = null;
        var span = some.append("span");
        assert.equal(span[0].length, 2);
        assert.equal(span[0][0].tagName, "SPAN");
        assert.isNull(span[0][1]);
        assert.isTrue(span[0][0].parentNode === div[0][0]);
        assert.isTrue(div[0][0].lastChild === span[0][0]);
        assert.isNull(div[0][1].lastChild);
      },
      "propagates data to new elements": function(div) {
        var a = new Object(), b = new Object(), span = div.data([a, b]).append("span");
        assert.strictEqual(span[0][0].__data__, a);
        assert.strictEqual(span[0][1].__data__, b);
      },
      "returns a new selection": function(div) {
        assert.isFalse(div.append("div") === div);
      }
    }
  });
  
  suite.addBatch({
    "selectAll(div).data(…).enter()": {
      topic: function() {
        return d3.select("body");
      },
      "appends to the parent node": function(body) {
        var div = body.html("").selectAll("div").data(d3.range(2)).enter().append("div");
        assert.equal(div.length, 1);
        assert.equal(div[0].length, 2);
        assert.domEqual(div[0][0].parentNode, document.body);
        assert.domEqual(div[0][1].parentNode, document.body);
      },
      "propagates data to new elements": function(body) {
        var a = new Object(), b = new Object(), div = body.html("").selectAll("div").data([a, b]).enter().append("div");
        assert.strictEqual(div[0][0].__data__, a);
        assert.strictEqual(div[0][1].__data__, b);
      },
      "ignores null nodes": function(body) {
        body.html("").append("div");
        var div = body.selectAll("div").data(d3.range(3)).enter().append("div");
        assert.equal(div.length, 1);
        assert.equal(div[0].length, 3);
        assert.domNull(div[0][0]);
        assert.domEqual(div[0][1].parentNode, document.body);
        assert.domEqual(div[0][2].parentNode, document.body);
      }
    }
  });
  
  suite.export(module);
  