function drawTest (data, o, skip) {
    options.data = data;
    if (o) _.extend(options, o);

    if (!skip) TestFlotr.graphTypes.lines.draw(options);
    options.context = b.getContext('2d');
    StableFlotr.graphTypes.lines.draw(options);

    expect(b).toImageDiffEqual(a);
  }
@param skip bool  Skip test against development version (use this when developing test)