code: function indent(node) {
    var next = node;
    var i = 0;
    while (next) {
      ++i;
      next = next.suite || next.parent;
    }
    return Array(i).join('  ');
  }
docs: Return indent for suite|test.
  
  @param {Suite|Test} node
  @returns {String}
  @api private