cats.effect.kernel.testkit.FreeSyncGenerators.scala Maven / Gradle / Ivy
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/*
* Copyright 2020-2021 Typelevel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cats.effect
package kernel
package testkit
import cats.{Eval, Monad, MonadError}
import cats.free.FreeT
import org.scalacheck.{Arbitrary, Cogen, Gen}
import scala.concurrent.duration.FiniteDuration
import java.util.concurrent.TimeUnit
import freeEval._
object FreeSyncGenerators {
implicit def cogenFreeSync[F[_]: Monad, A](
implicit C: Cogen[F[A]]): Cogen[FreeT[Eval, F, A]] =
C.contramap(run(_))
def generators[F[_]](implicit F0: MonadError[F, Throwable]) =
new SyncGenerators[FreeT[Eval, F, *]] {
val arbitraryE: Arbitrary[Throwable] =
Arbitrary(Arbitrary.arbitrary[Int].map(TestException(_)))
val cogenE: Cogen[Throwable] =
Cogen[Int].contramap(_.asInstanceOf[TestException].i)
val arbitraryFD: Arbitrary[FiniteDuration] = {
import TimeUnit._
val genTU =
Gen.oneOf(NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS)
Arbitrary {
genTU flatMap { u => Gen.posNum[Long].map(FiniteDuration(_, u)) }
}
}
val F: Sync[FreeT[Eval, F, *]] =
syncForFreeT[F]
}
implicit def arbitraryFreeSync[F[_], A: Arbitrary: Cogen](
implicit F: MonadError[F, Throwable]): Arbitrary[FreeT[Eval, F, A]] =
Arbitrary(generators[F].generators[A])
}
final case class TestException(i: Int) extends Exception