override val address = factory.newAddress("example.com")

  fun addPlan(): FakePlan =
    FakePlan(nextPlanId++).also {
      plans += it
    }

  override fun isCanceled() = canceled

  override fun plan(): FakePlan {
    // Return deferred plans preferentially. These don't require addPlan().
    if (deferredPlans.isNotEmpty()) return deferredPlans.removeFirst() as FakePlan

    }

    /**
     * Adds a language to filter by.
     * @param lang The language.
     * @return This builder instance.
     */
    public SuggestRequestBuilder addLang(final String lang) {
        request.addLang(lang);
        return this;
    }