@Test public void putAll() { User batMan = newUser("batMan"); User spiderMan = newUser("spiderMan"); User superMan = newUser("superMan"); Map<String, User> userMap = getUsersAsMap(batMan, spiderMan, superMan); assertThat(users.keySet().containsAll(userMap.keySet())).isFalse(); assertThat(users.values().containsAll(userMap.values())).isFalse(); usersTemplate.putAll(userMap); assertThat(users.keySet().containsAll(userMap.keySet())).isTrue(); assertThat(users.values().containsAll(userMap.values())).isTrue(); }