Merge pull request #173 from skennedy/feat/retrying-support-1.x

Add support for scalatest eventually by implementing Retrying typeclass (1.x)

scalatest/shared/src/main/scala/cats/effect/testing/scalatest/AsyncIOSpec.scala

@@ -16,8 +16,12 @@
 
 package cats.effect.testing.scalatest
 
+import cats.effect.IO
 import cats.effect.unsafe.{IORuntime, IORuntimeConfig}
+import org.scalactic.source.Position
 import org.scalatest.AsyncTestSuite
+import org.scalatest.enablers.Retrying
+import org.scalatest.time.Span
 
 trait AsyncIOSpec extends AssertingSyntax with EffectTestSupport { asyncTestSuite: AsyncTestSuite =>
 
@@ -26,4 +30,11 @@ trait AsyncIOSpec extends AssertingSyntax with EffectTestSupport { asyncTestSuit
 
     IORuntime(executionContext, executionContext, scheduler, sd, IORuntimeConfig())
   }
+
+  implicit def ioRetrying[T]: Retrying[IO[T]] = new Retrying[IO[T]] {
+    override def retry(timeout: Span, interval: Span, pos: Position)(fun: => IO[T]): IO[T] =
+      IO.fromFuture(
+        IO(Retrying.retryingNatureOfFutureT[T](executionContext).retry(timeout, interval, pos)(fun.unsafeToFuture())),
+      )
+  }
 }