Add scala code highlight test

tests/syntax-tests/highlighted/Scala/ConcurrentEffectLaws.scala

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+/*
+ * Copyright (c) 2017-2019 The Typelevel Cats-effect Project Developers
+ *
+ * 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
+package effect
+package laws
+
+import cats.effect.concurrent.Deferred
+import cats.syntax.all._
+import cats.laws._
+
+import scala.concurrent.Promise
+
+trait ConcurrentEffectLaws[F[_]] extends ConcurrentLaws[F] with EffectLaws[F] {
+  implicit def F: ConcurrentEffect[F]
+
+  def runAsyncRunCancelableCoherence[A](fa: F[A]) = {
+    val fa1 = IO.async[A] { cb =>
+      F.runAsync(fa)(r => IO(cb(r))).unsafeRunSync()
+    }
+    val fa2 = IO.cancelable[A] { cb =>
+      F.toIO(F.runCancelable(fa)(r => IO(cb(r))).unsafeRunSync())
+    }
+    fa1 <-> fa2
+  }
+
+  def runCancelableIsSynchronous[A] = {
+    val lh = Deferred.uncancelable[F, Unit].flatMap { latch =>
+      val spawned = Promise[Unit]()
+      // Never ending task
+      val ff = F.cancelable[A] { _ =>
+        spawned.success(()); latch.complete(())
+      }
+      // Execute, then cancel
+      val token = F.delay(F.runCancelable(ff)(_ => IO.unit).unsafeRunSync()).flatMap { cancel =>
+        // Waiting for the task to start before cancelling it
+        Async.fromFuture(F.pure(spawned.future)) >> cancel
+      }
+      F.liftIO(F.runAsync(token)(_ => IO.unit).toIO) *> latch.get
+    }
+    lh <-> F.unit
+  }
+
+  def runCancelableStartCancelCoherence[A](a: A) = {
+    // Cancellation via runCancelable
+    val f1: F[A] = for {
+      effect1 <- Deferred.uncancelable[F, A]
+      latch <- F.delay(Promise[Unit]())
+      never = F.cancelable[A] { _ =>
+        latch.success(()); effect1.complete(a)
+      }
+      cancel <- F.liftIO(F.runCancelable(never)(_ => IO.unit).toIO)
+      // Waiting for the task to start before cancelling it
+      _ <- Async.fromFuture(F.pure(latch.future)) // TODO get rid of this, IO, and Future here
+      _ <- cancel
+      result <- effect1.get
+    } yield result
+
+    // Cancellation via start.flatMap(_.cancel)
+    val f2: F[A] = for {
+      effect2 <- Deferred.uncancelable[F, A]
+      // Using a latch to ensure that the task started
+      latch <- Deferred.uncancelable[F, Unit]
+      never = F.bracket(latch.complete(()))(_ => F.never[Unit])(_ => effect2.complete(a))
+      fiber <- F.start(never)
+      // Waiting for the task to start before cancelling it
+      _ <- latch.get
+      _ <- F.start(fiber.cancel)
+      result <- effect2.get
+    } yield result
+
+    f1 <-> f2
+  }
+
+  def toIORunCancelableConsistency[A](fa: F[A]) =
+    ConcurrentEffect.toIOFromRunCancelable(fa) <-> F.toIO(fa)
+}
+
+object ConcurrentEffectLaws {
+  def apply[F[_]](implicit F0: ConcurrentEffect[F], contextShift0: ContextShift[F]): ConcurrentEffectLaws[F] =
+    new ConcurrentEffectLaws[F] {
+      val F = F0
+      val contextShift = contextShift0
+    }
+}

tests/syntax-tests/source/Scala/ConcurrentEffectLaws.scala

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+/*
+ * Copyright (c) 2017-2019 The Typelevel Cats-effect Project Developers
+ *
+ * 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
+package effect
+package laws
+
+import cats.effect.concurrent.Deferred
+import cats.syntax.all._
+import cats.laws._
+
+import scala.concurrent.Promise
+
+trait ConcurrentEffectLaws[F[_]] extends ConcurrentLaws[F] with EffectLaws[F] {
+  implicit def F: ConcurrentEffect[F]
+
+  def runAsyncRunCancelableCoherence[A](fa: F[A]) = {
+    val fa1 = IO.async[A] { cb =>
+      F.runAsync(fa)(r => IO(cb(r))).unsafeRunSync()
+    }
+    val fa2 = IO.cancelable[A] { cb =>
+      F.toIO(F.runCancelable(fa)(r => IO(cb(r))).unsafeRunSync())
+    }
+    fa1 <-> fa2
+  }
+
+  def runCancelableIsSynchronous[A] = {
+    val lh = Deferred.uncancelable[F, Unit].flatMap { latch =>
+      val spawned = Promise[Unit]()
+      // Never ending task
+      val ff = F.cancelable[A] { _ =>
+        spawned.success(()); latch.complete(())
+      }
+      // Execute, then cancel
+      val token = F.delay(F.runCancelable(ff)(_ => IO.unit).unsafeRunSync()).flatMap { cancel =>
+        // Waiting for the task to start before cancelling it
+        Async.fromFuture(F.pure(spawned.future)) >> cancel
+      }
+      F.liftIO(F.runAsync(token)(_ => IO.unit).toIO) *> latch.get
+    }
+    lh <-> F.unit
+  }
+
+  def runCancelableStartCancelCoherence[A](a: A) = {
+    // Cancellation via runCancelable
+    val f1: F[A] = for {
+      effect1 <- Deferred.uncancelable[F, A]
+      latch <- F.delay(Promise[Unit]())
+      never = F.cancelable[A] { _ =>
+        latch.success(()); effect1.complete(a)
+      }
+      cancel <- F.liftIO(F.runCancelable(never)(_ => IO.unit).toIO)
+      // Waiting for the task to start before cancelling it
+      _ <- Async.fromFuture(F.pure(latch.future)) // TODO get rid of this, IO, and Future here
+      _ <- cancel
+      result <- effect1.get
+    } yield result
+
+    // Cancellation via start.flatMap(_.cancel)
+    val f2: F[A] = for {
+      effect2 <- Deferred.uncancelable[F, A]
+      // Using a latch to ensure that the task started
+      latch <- Deferred.uncancelable[F, Unit]
+      never = F.bracket(latch.complete(()))(_ => F.never[Unit])(_ => effect2.complete(a))
+      fiber <- F.start(never)
+      // Waiting for the task to start before cancelling it
+      _ <- latch.get
+      _ <- F.start(fiber.cancel)
+      result <- effect2.get
+    } yield result
+
+    f1 <-> f2
+  }
+
+  def toIORunCancelableConsistency[A](fa: F[A]) =
+    ConcurrentEffect.toIOFromRunCancelable(fa) <-> F.toIO(fa)
+}
+
+object ConcurrentEffectLaws {
+  def apply[F[_]](implicit F0: ConcurrentEffect[F], contextShift0: ContextShift[F]): ConcurrentEffectLaws[F] =
+    new ConcurrentEffectLaws[F] {
+      val F = F0
+      val contextShift = contextShift0
+    }
+}

tests/syntax-tests/source/Scala/LICENSE.md

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