void clear_empty(void **state);
void reset_after_create(void **state);
void find_after_create(void **state);
void get_after_create_returns_null(void **state);
void add_one_and_complete(void **state);
void add_two_and_complete_returns_first(void **state);
void add_two_and_complete_returns_second(void **state);
void add_two_adds_two(void **state);
void add_two_same_adds_one(void **state);
void add_two_same_updates(void **state);