Thread.sleep(500);
assertNull(cache.put("g", "#g"));
assertEquals(7, cache.size());
assertTrue(cache.containsKey("a"));
assertTrue(cache.containsKey("b"));
assertTrue(cache.containsKey("c"));
assertTrue(cache.containsKey("d"));
assertTrue(cache.containsKey("e"));
assertTrue(cache.containsKey("f"));
assertTrue(cache.containsKey("g"));