protected void saveChart(BufferedImage img, String name) throws IOException {
File target = new File("target/test-tmp/chart/");
FileUtils.forceMkdir(target);
ByteArrayOutputStream imgOutput = new ByteArrayOutputStream();
ChartUtilities.writeBufferedImageAsPNG(imgOutput, img, true, 0);
OutputStream out = new FileOutputStream(new File(target, name));
out.write(imgOutput.toByteArray());
out.close();
}
protected void assertChartSizeLesserThan(BufferedImage img, int size) throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
ChartUtilities.writeBufferedImageAsPNG(output, img, true, 0);
assertTrue("PNG size in bits=" + output.size(), output.size() < size);
}