text: export function barAxisLabelCheck(selector) {
  // check axis ticks and output text
  
    selector = selector || "svg > g > g.axis-x g.tick"
    test("check labels for "+selector, function (t) {
      $(selector).each(function () {
        var tick = $(this).text()
        t.ok(tick, selector+" tick = " + tick)
      })
      t.end()
    })
  }