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package eu.mulk.fibers
import minitest._
import minitest.laws.Checkers
import monix.eval.Task
import monix.execution.Ack.{Continue, Stop}
import monix.execution.Scheduler.Implicits.global
import monix.execution.{Ack, Scheduler}
import monix.reactive.observers.Subscriber
import monix.reactive.{Consumer, Observable}
import scala.concurrent.Future
import scala.util.{Failure, Success, Try}
object FiberSpec extends SimpleTestSuite with Checkers {
import Fiber._
class FakeException extends RuntimeException
test("sanity") {
assert(0 != 1)
}
testAsync("can produce nothing") {
val o = run {}
for (empty ← o.isEmptyL) {
assert(empty)
}
}
testAsync("can produce a single value") {
val o = run[Int] {
emit(100)
}
for (l ← o.toListL) {
assert(l == List(100))
}
}
testAsync("can produce many values") {
val o = run[Int] {
for (x ← 1.to(10).cps)
emit(x)
}
for (l ← o.toListL) {
assertEquals(l, List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
}
}
testAsync("can throw exceptions before emitting values") {
val o = run[Int] {
throw new FakeException
}
for (t ← o.toListL.failed) {
assert(t.isInstanceOf[FakeException])
}
}
testAsync("can throw exceptions after emitting values") {
val o = run[Int] {
emit(100)
throw new FakeException
}
for (t ← o.toListL.failed) {
assert(t.isInstanceOf[FakeException])
}
}
testAsync("can await standard futures") {
val err = new FakeException
val f1 = Future(1)
val f2 = Future.failed(err)
val f3 = Future(3)
val o = run[Try[Int]] {
val y1 = await(f1)
emit(y1)
val y2 = await(f2)
emit(y2)
val y3 = await(f3)
emit(y3)
}
for (t ← o.toListL) {
assertEquals(t, List(Success(1), Failure(err), Success(3)))
}
}
testAsync("can run Monix tasks") {
val err = new FakeException
val f1 = Task.delay(1)
val f2 = Task.raiseError(err)
val f3 = Task.delay(3)
val o = run[Try[Int]] {
val y1 = await(f1)
emit(y1)
val y2 = await(f2)
emit(y2)
val y3 = await(f3)
emit(y3)
}
for (t ← o.toListL) {
assertEquals(t, List(Success(1), Failure(err), Success(3)))
}
}
testAsync("can spawn two fibers, one waiting for the other") {
val o1: Observable[Int] = run[Int] {
emit(1)
emit(2)
emit(3)
}
lazy val o2: Observable[Int] = run[Int] {
val Success(a1) = await(o1.drop(0).firstL)
emit(a1)
val Success(a2) = await(o1.drop(1).firstL)
emit(a2)
val Success(a3) = await(o1.drop(2).firstL)
emit(a3)
}
for (t2 ← o2.toListL) {
assertEquals(t2, List(1, 2, 3))
}
}
testAsync("can spawn two mutually waiting fibers") {
lazy val o1: Observable[Int] = run[Int] {
emit(1)
val Success(b1) = await(o2.firstL)
emit(b1 + 1)
val Success(b2) = await(o2.tail.firstL)
emit(b2 + 1)
}.cache
lazy val o2: Observable[Int] = run[Int] {
val Success(a1) = await(o1.firstL)
emit(a1 + 1)
val Success(a2) = await(o1.tail.firstL)
emit(a2 + 1)
}.cache
for (t1 ← o1.toListL;
t2 ← o2.toListL) {
assertEquals(t1, List(1, 3, 5))
assertEquals(t2, List(2, 4))
}
}
testAsync("can store fiber-local state") {
lazy val o = run {
putFiberVar(100)
emit(1)
val state = getFiberVar.asInstanceOf[Int]
emit(state)
}
for (l ← o.toListL) {
assertEquals(l, List(1, 100))
}
}
testAsync("can properly maintain state between two alternating fibers") {
val o1: Observable[Int] = run {
putFiberVar(2)
emit(1)
val a2 = getFiberVar
putFiberVar(3)
emit(a2)
val a3 = getFiberVar
emit(a3)
}
lazy val o2: Observable[Int] = run {
putFiberVar(100)
val Success(a1) = await(o1.drop(0).firstL)
emit(a1)
emit(getFiberVar)
val Success(a2) = await(o1.drop(1).firstL)
emit(a2)
emit(getFiberVar)
val Success(a3) = await(o1.drop(2).firstL)
emit(a3)
emit(getFiberVar)
}
for (t2 ← o2.toListL) {
assertEquals(t2, List(1, 100, 2, 100, 3, 100))
}
}
testAsync("can be stopped") {
var f3executed = false
val f1 = Task.delay(1)
val f2 = Task.delay(2)
val f3 = Task.delay({ f3executed = true; 3 })
val o: Observable[Int] = run {
val Success(y1) = await(f1)
emit(y1)
val Success(y2) = await(f2)
emit(y2)
val Success(y3) = await(f3)
emit(y3)
}
val consumeTask = o.consumeWith(Consumer.create[Int, Int] {
(scheduler, cancelable, cb) ⇒
new Subscriber.Sync[Int] {
var triggered = 0
override implicit def scheduler: Scheduler =
monix.execution.Scheduler.Implicits.global
override def onNext(elem: Int): Ack = {
triggered += 1
if (triggered >= 2) {
cb.onSuccess(triggered)
Stop
} else {
Continue
}
}
override def onError(ex: Throwable): Unit =
cb.onError(ex)
override def onComplete(): Unit =
()
}
})
for (result ← consumeTask) {
assertEquals(result, 2)
assert(!f3executed)
}
}
}
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