private void testFormat(String format) { ImageReader reader = ImageIO.getImageReadersByFormatName(format).next(); ImageWriter writer = ImageIO.getImageWritersByFormatName(format).next(); assertEquals( "getImageReader() returns an incorrect reader for " + format, ImageIO.getImageReader(writer).getClass(), reader.getClass()); assertEquals( "getImageWriter() returns an incorrect writer for " + format, ImageIO.getImageWriter(reader).getClass(), writer.getClass()); }