require("../env");

require("../../d3");

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("selection.empty");

suite.addBatch({

  "select(body)": {

    topic: function() {

      return d3.select("body").html("");

    },

    "returns true for empty selections": function(body) {

      assert.isTrue(body.select("foo").empty());

    },

    "returns false for non-empty selections": function(body) {

      assert.isFalse(body.empty());

    },

    "ignores null nodes": function(body) {

      var some = d3.select("body");

      some[0][0] = null;

      assert.isTrue(some.empty());

    }

  }

});

suite.addBatch({

  "selectAll(div)": {

    topic: function() {

      var body = d3.select("body").html("");

      body.append("div").append("span");

      body.append("div");

      return body.selectAll("div");

    },

    "returns true for empty selections": function(div) {

      assert.isTrue(div.select("foo").empty());

    },

    "returns false for non-empty selections": function(div) {

      assert.isFalse(div.empty());

      assert.isFalse(div.select("span").empty());

    },

    "ignores null nodes": function(div) {

      var some = d3.selectAll("div");

      some[0][0] = null;

      assert.isTrue(some.select("span").empty());

    }

  }

});

suite.export(module);