System.out.println("Properties p should be empty:");
assertEquals(p.size(), 0);
p.list(System.out);
p.setProperty("foo", "bar");
((FileProperties)p).save();
p = new FileProperties(TEST_FILE_NAME);
System.out.println("This properties should be have foo=bar:");
p.list(System.out);
new File("no such file").delete();