require("../env");

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

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("d3.selection");

suite.addBatch({

  "selection": {

    topic: function() {

      return d3.selection();

    },

    "selects the document": function(selection) {

      assert.equal(selection.length, 1);

      assert.equal(selection[0].length, 1);

      assert.equal(selection[0][0], document);

    },

    "is an instanceof d3.selection": function(selection) {

      assert.isTrue(selection instanceof d3.selection);

    },

    "subselections are also instanceof d3.selection": function(selection) {

      assert.isTrue(selection.select("body") instanceof d3.selection);

      assert.isTrue(selection.selectAll("body") instanceof d3.selection);

    },

    "selection prototype can be extended": function(selection) {

      d3.selection.prototype.foo = function(v) { return this.attr("foo", v); };

      selection.select("body").foo(42);

      assert.equal(document.body.getAttribute("foo"), "42");

      delete d3.selection.prototype.foo;

    }

  }

});

suite.export(module);