public void testExpiredData() throws InterruptedException {
dc.put("k", "v", -1, 6000000);
Thread.sleep(100);
InternalCacheEntry entry = dc.get("k");
assert entry.getClass().equals(transienttype());
assert entry.getLastUsed() <= System.currentTimeMillis();
long entryLastUsed = entry.getLastUsed();
Thread.sleep(100);
entry = dc.get("k");
assert entry.getLastUsed() > entryLastUsed;
dc.put("k", "v", -1, 0);
dc.purgeExpired();
dc.put("k", "v", 6000000, -1);
Thread.sleep(100);
assert dc.size() == 1;
entry = dc.get("k");
assert entry != null : "Entry should not be null!";
assert entry.getClass().equals(mortaltype())
: "Expected " + mortaltype() + ", was " + entry.getClass().getSimpleName();
assert entry.getCreated() <= System.currentTimeMillis();
dc.put("k", "v", 0, -1);
Thread.sleep(10);
assert dc.get("k") == null;
assert dc.size() == 0;
dc.put("k", "v", 0, -1);
Thread.sleep(100);
assert dc.size() == 1;
dc.purgeExpired();
assert dc.size() == 0;
}
