1 require("../env");

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

     3 

     4 var vows = require("vows"),

     5     assert = require("assert");

     6 

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

     8 

     9 suite.addBatch({

    10   "select(body)": {

    11     topic: function() {

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

    13     },

    14     "calls the function once": function(body) {

    15       var count = 0;

    16       body.call(function() { ++count; });

    17       assert.equal(count, 1);

    18     },

    19     "passes any optional arguments": function(body) {

    20       var abc;

    21       body.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");

    22       assert.deepEqual(abc, ["a", "b", "c"]);

    23     },

    24     "passes the selection as the first argument": function(body) {

    25       var s;

    26       body.call(function(selection) { s = selection; });

    27       assert.isTrue(s === body);

    28     },

    29     "uses the selection as the context": function(body) {

    30       var s;

    31       body.call(function() { s = this; });

    32       assert.isTrue(s === body);

    33     },

    34     "returns the current selection": function(body) {

    35       assert.isTrue(body.call(function() {}) === body);

    36     }

    37   }

    38 });

    39 

    40 suite.addBatch({

    41   "selectAll(div)": {

    42     topic: function() {

    43       return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");

    44     },

    45     "calls the function once": function(div) {

    46       var count = 0;

    47       div.call(function() { ++count; });

    48       assert.equal(count, 1);

    49     },

    50     "passes any optional arguments": function(div) {

    51       var abc;

    52       div.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");

    53       assert.deepEqual(abc, ["a", "b", "c"]);

    54     },

    55     "passes the selection as the first argument": function(div) {

    56       var s;

    57       div.call(function(selection) { s = selection; });

    58       assert.isTrue(s === div);

    59     },

    60     "uses the selection as the context": function(div) {

    61       var s;

    62       div.call(function() { s = this; });

    63       assert.isTrue(s === div);

    64     },

    65     "returns the current selection": function(div) {

    66       assert.isTrue(div.call(function() {}) === div);

    67     }

    68   }

    69 });

    70 

    71 suite.export(module);