import cats.effect.IO
import cats.effect.testing.specs2.CatsEffect
import org.specs2.mutable.Specification

// for some reason, only class works here; object will not be detected by sbt
class ExampleSpec extends Specification with CatsEffect {
  "examples" should {
    "do the things" in IO {
      true must beTrue
    }
  }
}

override val Timeout = 5.seconds

import cats.effect.{IO, Ref, Resource}
import org.specs2.mutable.SpecificationLike

class CatsResourceSpecs extends CatsResource[IO, Ref[IO, Int]] with SpecificationLike {
  sequential

  val resource: Resource[IO, Ref[IO, Int]] =
    Resource.make(Ref[IO].of(0))(_.set(Int.MinValue))

  "cats resource support" should {
    "run a resource modification" in withResource { ref =>
      ref.modify{ a =>
        (a + 1, a)
      }.map(
        _ must_=== 0
      )
    }

    "be shared between tests" in withResource { ref =>
      ref.modify{ a =>
        (a + 1, a)
      }.map(
        _ must_=== 1
      )
    }
  }
}

libraryDependencies += "org.typelevel" %% "cats-effect-testing-specs2" % "<version>" % Test

import cats.effect._
import cats.effect.testing.scalatest.AsyncIOSpec
import org.scalatest.matchers.should.Matchers
import org.scalatest.freespec.AsyncFreeSpec

class MySpec extends AsyncFreeSpec with AsyncIOSpec with Matchers {

  "My Code " - {
    "works" in {
      IO(1).asserting(_ shouldBe 1)
    }
}

libraryDependencies += "org.typelevel" %% "cats-effect-testing-scalatest" % "<version>" % Test

import scala.concurrent.duration._
import utest._
import cats.implicits._
import cats.effect.IO
import cats.effect.testing.utest.IOTestSuite

object SimpleSuite extends IOTestSuite {
  override val timeout = 1.second // Default timeout is 10 seconds

  val tests = Tests {
    test("do the thing") {
      IO(assert(true))
    }
  }
}

libraryDependencies += "org.typelevel" %% "cats-effect-testing-utest" % "<version>" % Test

import scala.concurrent.duration._
import cats.implicits._
import cats.effect.IO
import cats.effect.testing.minitest.IOTestSuite

object SimpleSuite extends IOTestSuite {
  override val timeout = 1.second // Default timeout is 10 seconds

  test("do the thing") {
    IO(assert(true))
  }
}

libraryDependencies += "org.typelevel" %% "cats-effect-testing-minitest" % "<version>" % Test