public synchronized Account createAndAddRandomAccount() {
    return createAndAddRandomAccount(
        QuotaResourceType.values()[Utils.getRandomShort(TestUtils.RANDOM) % QuotaResourceType.values().length]);
  }
Creates and adds an {@link Account} to this {@link AccountService}. The account will contain one container
with {@link Container#DEFAULT_PUBLIC_CONTAINER_ID}, one with {@link Container#DEFAULT_PRIVATE_CONTAINER_ID} and
one other random {@link Container}.
@return the {@link Account} that was created and added.
ambry-test-utils/src/main/java/com/github/ambry/account/InMemAccountService.java