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.hierarchy");

     9 

    10 suite.addBatch({

    11   "hierarchy": {

    12     topic: function() {

    13       return d3.layout.treemap(); // hierarchy is abstract, so test a subclass

    14     },

    15     "doesn't overwrite the value of a node that has an empty children array": function(hierarchy) {

    16       var nodes = hierarchy.sticky(true).nodes({value: 1, children: []});

    17       assert.equal(nodes[0].value, 1);

    18       hierarchy.nodes(nodes[0]);

    19       assert.equal(nodes[0].value, 1);

    20     },

    21     "a valueless node that has an empty children array gets a value of 0": function(hierarchy) {

    22       var nodes = hierarchy.sticky(true).nodes({children: []});

    23       assert.equal(nodes[0].value, 0);

    24       hierarchy.nodes(nodes[0]);

    25       assert.equal(nodes[0].value, 0);

    26     }

    27   }

    28 });

    29 

    30 suite.export(module);