text: {
    var tile = d3_hierarchy.treemapResquarify,
      root = {
        value: 20,
        children: [
          {
            value: 10
          },
          {
            value: 10
          }
        ]
      };
    tile(root, 0, 0, 20, 10);
    test.deepEqual(root.children.map(round), [
      {
        x0: 0,
        x1: 10,
        y0: 0,
        y1: 10
      },
      {
        x0: 10,
        x1: 20,
        y0: 0,
        y1: 10
      }
    ]);
    tile(root, 0, 0, 10, 20);
    test.deepEqual(root.children.map(round), [
      {
        x0: 0,
        x1: 5,
        y0: 0,
        y1: 20
      },
      {
        x0: 5,
        x1: 10,
        y0: 0,
        y1: 20
      }
    ]);
    test.end();
  }
  