@Test(dataProvider = "invalidateData")
public void invalidate(String prefix, boolean readOnly, String key, String memcacheKey) {

    MemcachedClient client = mock(MemcachedClient.class);
    MemcachedResponseStore store = new MemcachedResponseStore(client, prefix, readOnly);
    store.invalidate(key);
    if (!readOnly) {
        verify(client).delete(memcacheKey);
    }
    verifyNoMoreInteractions(client);
}