1 require("../env");

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

     3 

     4 var vows = require("vows"),

     5     assert = require("assert");

     6 

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

     8 

     9 suite.addBatch({

    10   "sum": {

    11     topic: function() {

    12       return d3.sum;

    13     },

    14     "sums numbers": function(sum) {

    15       assert.equal(d3.sum([1]), 1);

    16       assert.equal(d3.sum([5, 1, 2, 3, 4]), 15);

    17       assert.equal(d3.sum([20, 3]), 23);

    18       assert.equal(d3.sum([3, 20]), 23);

    19     },

    20     "sums types that can be coerced to numbers": function(sum) {

    21       assert.equal(d3.sum(["20", "3"]), 23);

    22       assert.equal(d3.sum(["3", "20"]), 23);

    23       assert.equal(d3.sum(["3", 20]), 23);

    24       assert.equal(d3.sum([20, "3"]), 23);

    25       assert.equal(d3.sum([3, "20"]), 23);

    26       assert.equal(d3.sum(["20", 3]), 23);

    27     },

    28     "ignores non-numeric types": function(sum) {

    29       assert.equal(d3.sum(["a", "b", "c"]), 0);

    30       assert.equal(d3.sum(["a", 1, "2"]), 3);

    31     },

    32     "ignores null, undefined and NaN": function(sum) {

    33       assert.equal(d3.sum([NaN, 1, 2, 3, 4, 5]), 15);

    34       assert.equal(d3.sum([1, 2, 3, 4, 5, NaN]), 15);

    35       assert.equal(d3.sum([10, null, 3, undefined, 5, NaN]), 18);

    36     },

    37     "applies the optional acccessor function": function(sum) {

    38       assert.equal(d3.sum([[1, 2, 3, 4, 5], [2, 4, 6, 8, 10]], function(d) { return d3.sum(d); }), 45);

    39       assert.equal(d3.sum([1, 2, 3, 4, 5], function(d, i) { return i; }), 10);

    40     },

    41     "returns zero for the empty array": function(sum) {

    42       assert.equal(d3.sum([]), 0);

    43     }

    44   }

    45 });

    46 

    47 suite.export(module);