dns.assertRequests(uriHost)
    assertThat(selection.hasNext()).isFalse()
    assertFailsWith<NoSuchElementException> {
      selection.next()
    }
    assertThat(routeSelector.hasNext()).isFalse()
    assertFailsWith<NoSuchElementException> {
      routeSelector.next()
    }
  }

  @Test fun singleRouteReturnsFailedRoute() {
    val address = factory.newAddress()

            // has disappeared! Skip it.
          }
        }

        return false
      }

      override fun next(): String {
        if (!hasNext()) throw NoSuchElementException()
        val result = nextUrl!!
        nextUrl = null
        canRemove = true
        return result
      }

      override fun remove() {
        check(canRemove) { "remove() before next()" }

            return true
          }
        }

        return false
      }

      override fun next(): Snapshot {
        if (!hasNext()) throw NoSuchElementException()
        removeSnapshot = nextSnapshot
        nextSnapshot = null
        return removeSnapshot!!
      }

      override fun remove() {
        val removeSnapshot = this.removeSnapshot