1 require("../env");

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

     3 

     4 var vows = require("vows"),

     5     assert = require("assert");

     6 

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

     8 

     9 suite.addBatch({

    10   "keys": {

    11     topic: function() {

    12       return d3.keys;

    13     },

    14     "enumerates every defined key": function(keys) {

    15       assert.deepEqual(keys({a: 1, b: 1}), ["a", "b"]);

    16     },

    17     "includes keys defined on prototypes": function(keys) {

    18       function abc() {

    19         this.a = 1;

    20         this.b = 2;

    21       }

    22       abc.prototype.c = 3;

    23       assert.deepEqual(keys(new abc()), ["a", "b", "c"]);

    24     },

    25     "includes keys with null or undefined values": function(keys) {

    26       assert.deepEqual(keys({a: undefined, b: null, c: NaN}), ["a", "b", "c"]);

    27     }

    28   }

    29 });

    30 

    31 suite.export(module);