1 require("../env");

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

     3 

     4 var vows = require("vows"),

     5     assert = require("assert");

     6 

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

     8 

     9 suite.addBatch({

    10   "select(body)": {

    11     topic: function() {

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

    13     },

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

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

    16     },

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

    18       assert.isFalse(body.empty());

    19     },

    20     "ignores null nodes": function(body) {

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

    22       some[0][0] = null;

    23       assert.isTrue(some.empty());

    24     }

    25   }

    26 });

    27 

    28 suite.addBatch({

    29   "selectAll(div)": {

    30     topic: function() {

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

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

    33       body.append("div");

    34       return body.selectAll("div");

    35     },

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

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

    38     },

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

    40       assert.isFalse(div.empty());

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

    42     },

    43     "ignores null nodes": function(div) {

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

    45       some[0][0] = null;

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

    47     }

    48   }

    49 });

    50 

    51 suite.export(module);