it("associates data series for a 2-axis graph", function () {
    expect(cf.getDataSeriesByAxis(twoAxes, "y").length).toBe(1);
    expect(cf.getDataSeriesByAxis(twoAxes, "y2").length).toBe(1);
    expect(cf.getDataSeriesByAxis(twoAxes, "fakeaxis").length).toBe(0);
  });