1 require("../env");

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

     3 

     4 var vows = require("vows"),

     5     assert = require("assert");

     6 

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

     8 

     9 suite.addBatch({

    10   "numbers": {

    11     "returns a negative number if a > b": function() {

    12       assert.isTrue(d3.descending(1, 0) < 0);

    13     },

    14     "returns a positive number if a < b": function() {

    15       assert.isTrue(d3.descending(0, 1) > 0);

    16     },

    17     "returns zero if a == b": function() {

    18       assert.equal(d3.descending(0, 0), 0);

    19     },

    20     "returns NaN if a or b is undefined": function() {

    21       assert.isNaN(d3.descending(0, undefined));

    22       assert.isNaN(d3.descending(undefined, 0));

    23       assert.isNaN(d3.descending(undefined, undefined));

    24     },

    25     "returns NaN if a or b is NaN": function() {

    26       assert.isNaN(d3.descending(0, NaN));

    27       assert.isNaN(d3.descending(NaN, 0));

    28       assert.isNaN(d3.descending(NaN, NaN));

    29     }

    30   }

    31 });

    32 

    33 suite.addBatch({

    34   "strings": {

    35     "returns a negative number if a > b": function() {

    36       assert.isTrue(d3.descending("b", "a") < 0);

    37     },

    38     "returns a positive number if a < b": function() {

    39       assert.isTrue(d3.descending("a", "b") > 0);

    40     },

    41     "returns zero if a == b": function() {

    42       assert.equal(d3.descending("a", "a"), 0);

    43     }

    44   }

    45 });

    46 

    47 suite.export(module);