1 require("../env");

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

     3 

     4 var vows = require("vows"),

     5     assert = require("assert");

     6 

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

     8 

     9 suite.addBatch({

    10   "selection": {

    11     topic: function() {

    12       return d3.selection();

    13     },

    14     "selects the document": function(selection) {

    15       assert.equal(selection.length, 1);

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

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

    18     },

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

    20       assert.isTrue(selection instanceof d3.selection);

    21     },

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

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

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

    25     },

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

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

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

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

    30       delete d3.selection.prototype.foo;

    31     }

    32   }

    33 });

    34 

    35 suite.export(module);