public void setShouldUpdateSucceed(boolean shouldUpdateSucceed) {
    this.shouldUpdateSucceed = shouldUpdateSucceed;
  }
@param shouldUpdateSucceed the new value of {@code shouldUpdateSucceed}, which will be returned by subsequent
                           {@link #updateAccounts(Collection)} calls.
ambry-test-utils/src/main/java/com/github/ambry/account/InMemAccountService.java