require("../env");

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

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

var vows = require("vows"),

    assert = require("assert");

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

suite.addBatch({

  "cluster": {

    topic: d3.layout.cluster,

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

      assert.deepEqual(cluster.nodes({value: 1, children: [{value: 1, children: []}, {value: 1}]}).map(layout), [

        {value: 1, depth: 0, x: 0.5,  y: 0},

        {value: 1, depth: 1, x: 0.25, y: 1},

        {value: 1, depth: 1, x: 0.75, y: 1}

      ]);

    },

    "can handle zero-valued nodes": function(cluster) {

      assert.deepEqual(cluster.nodes({value: 0, children: [{value: 0}, {value: 1}]}).map(layout), [

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

        {value: 0, depth: 1, x: 0.25, y: 1},

        {value: 1, depth: 1, x: 0.75, y: 1}

      ]);

    }

  }

});

function layout(node) {

  return {

    value: node.value,

    depth: node.depth,

    x: node.x,

    y: node.y

  };

}

suite.export(module);