For each ppt in the test directory check that all sheets are properly initialized
File home = new File(System.getProperty("HSLF.testdata.path"));
File[] files = home.listFiles();
for (int i = 0; i < files.length; i++) {
if(!files[i].getName().endsWith(".ppt")) continue;
try {
FileInputStream is = new FileInputStream(files[i]);
HSLFSlideShow hslf = new HSLFSlideShow(is);
is.close();
SlideShow ppt = new SlideShow(hslf);
doSlideShow(ppt);
} catch (EncryptedPowerPointFileException e){
; //skip encrypted ppt
}
}