1 require("../env");

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

     3 require("../../d3.layout");

     4 

     5 var vows = require("vows"),

     6     assert = require("assert");

     7 

     8 var suite = vows.describe("d3.layout.tree");

     9 

    10 suite.addBatch({

    11   "tree": {

    12     topic: d3.layout.tree,

    13     "can handle an empty children array": function(tree) {

    14       assert.deepEqual(tree.nodes({children: []}).map(layout), [

    15         {depth: 0, x: 0.5, y: 0}

    16       ]);

    17       assert.deepEqual(tree.nodes({children: [

    18         {children: []},

    19         {children: [{}]},

    20         {children: [{}]}

    21       ]}).map(layout), [

    22         {depth: 0, x: .5,   y: 0},

    23         {depth: 1, x: .125, y: 0.5},

    24         {depth: 1, x: .375, y: 0.5},

    25         {depth: 2, x: .375, y: 1},

    26         {depth: 1, x: .875, y: 0.5},

    27         {depth: 2, x: .875, y: 1}

    28       ]);

    29     }

    30   }

    31 });

    32 

    33 function layout(node) {

    34   return {

    35     depth: node.depth,

    36     x: node.x,

    37     y: node.y

    38   };

    39 }

    40 

    41 suite.export(module);