Some simple test code we can use to play around with stuff in a REPL or simple project

mock_client_api.scala

import scala.concurrent._
import ExecutionContext.Implicits.global

object MockAPI {
  private val rand = new scala.util.Random()
  
  class RateLimitException(msg: String) extends Throwable(msg, null)
  
  def simpleService: Future[String] = Future { "1, 2, 3, 4, 5, 6" }
  
  def throwingRateLimitedService: Future[String] = Future {
    if (rand.nextInt(100) > 50) {
      throw new RateLimitException("Rate limit exceeded")
    }
    "1, 2, 3, 4, 5, 6"
  }
  
  def nonThrowingRateLimitedService: Future[String] = Future {
    if (rand.nextInt(100) > 50) {
      "RATELIMIT_EXCEEDED"
    }
    else {
      "1, 2, 3, 4, 5, 6"
    }
  }
  
  def maybeThrowingRateLimitedService: Future[String] = Future {
    rand.nextInt(100) match {
      case x if x > 75 => throw new RateLimitException("Rate limit exceeded")
      case x if x > 50 => "RATELIMIT_EXCEEDED"
      case _           => "1, 2, 3, 4, 5, 6"
    }
  }
}