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Move arbitrary instance of StateT to laws #1584

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Apr 19, 2017
Merged

Move arbitrary instance of StateT to laws #1584

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6efef84
move arbitray instance of StateT to laws
kailuowang Apr 3, 2017
16c06d7
fix FreeTTests
kailuowang Apr 3, 2017
b88b2a3
added arbitrary for Reader
kailuowang Apr 4, 2017
baf6ec4
added a test for the Reader Functor so that the arbitrary instance of…
kailuowang Apr 17, 2017
69a6413
minor
kailuowang Apr 17, 2017
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1 change: 1 addition & 0 deletions core/src/main/scala/cats/data/package.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ package object data {
val ReaderT = Kleisli

type Reader[A, B] = ReaderT[Id, A, B]

object Reader {
def apply[A, B](f: A => B): Reader[A, B] = ReaderT[Id, A, B](f)
}
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4 changes: 2 additions & 2 deletions free/src/test/scala/cats/free/FreeTTests.scala
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Expand Up @@ -7,7 +7,7 @@ import cats.data._
import cats.laws.discipline._
import cats.tests.CatsSuite
import cats.instances.option._

import cats.laws.discipline.arbitrary.catsLawArbitraryForState
import org.scalacheck.{Arbitrary, Gen, Cogen}

class FreeTTests extends CatsSuite {
Expand Down Expand Up @@ -209,7 +209,7 @@ trait FreeTTestsInstances {

implicit def intStateEq[A: Eq]: Eq[IntState[A]] = stateEq[Int, A]

implicit def intStateArb[A: Arbitrary]: Arbitrary[IntState[A]] = stateArbitrary[Int, A]
implicit def intStateArb[A: Arbitrary]: Arbitrary[IntState[A]] = catsLawArbitraryForState[Int, A]

implicit def freeTOptionEq[A](implicit A: Eq[A], OM: Monad[Option]): Eq[FreeTOption[A]] = new Eq[FreeTOption[A]] {
def eqv(a: FreeTOption[A], b: FreeTOption[A]) = Eq[Option[A]].eqv(a.runM(identity), b.runM(identity))
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16 changes: 14 additions & 2 deletions laws/src/main/scala/cats/laws/discipline/Arbitrary.scala
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Expand Up @@ -76,8 +76,6 @@ object arbitrary extends ArbitraryInstances0 {
B.perturb(seed, _),
(a, b) => A.perturb(B.perturb(seed, b), a)))

implicit def catsLawsArbitraryForKleisli[F[_], A, B](implicit F: Arbitrary[F[B]]): Arbitrary[Kleisli[F, A, B]] =
Arbitrary(F.arbitrary.map(fb => Kleisli[F, A, B](_ => fb)))

implicit def catsLawsArbitraryForCokleisli[F[_], A, B](implicit B: Arbitrary[B]): Arbitrary[Cokleisli[F, A, B]] =
Arbitrary(B.arbitrary.map(b => Cokleisli[F, A, B](_ => b)))
Expand Down Expand Up @@ -157,12 +155,26 @@ object arbitrary extends ArbitraryInstances0 {

implicit def catsLawsArbitraryForNested[F[_], G[_], A](implicit FG: Arbitrary[F[G[A]]]): Arbitrary[Nested[F, G, A]] =
Arbitrary(FG.arbitrary.map(Nested(_)))

implicit def catsLawArbitraryForState[S: Arbitrary: Cogen, A: Arbitrary]: Arbitrary[State[S, A]] =
catsLawArbitraryForStateT[Eval, S, A]

implicit def catsLawArbitraryForReader[A: Arbitrary, B: Arbitrary]: Arbitrary[Reader[A, B]] =
catsLawsArbitraryForKleisli[Id, A, B]
}

private[discipline] sealed trait ArbitraryInstances0 {

implicit def catsLawArbitraryForStateT[F[_]: Applicative, S, A](implicit F: Arbitrary[S => F[(S, A)]]): Arbitrary[StateT[F, S, A]] =
Arbitrary(F.arbitrary.map(f => StateT(f)))

implicit def catsLawsArbitraryForWriterT[F[_], L, V](implicit F: Arbitrary[F[(L, V)]]): Arbitrary[WriterT[F, L, V]] =
Arbitrary(F.arbitrary.map(WriterT(_)))

implicit def catsLawsCogenForWriterT[F[_], L, V](implicit F: Cogen[F[(L, V)]]): Cogen[WriterT[F, L, V]] =
F.contramap(_.run)

implicit def catsLawsArbitraryForKleisli[F[_], A, B](implicit F: Arbitrary[F[B]]): Arbitrary[Kleisli[F, A, B]] =
Arbitrary(F.arbitrary.map(fb => Kleisli[F, A, B](_ => fb)))

}
7 changes: 1 addition & 6 deletions tests/src/test/scala/cats/tests/StateTTests.scala
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Expand Up @@ -6,7 +6,7 @@ import cats.kernel.instances.tuple._
import cats.laws.discipline._
import cats.laws.discipline.eq._
import cats.laws.discipline.arbitrary._
import org.scalacheck.{Arbitrary, Cogen}
import org.scalacheck.Arbitrary

class StateTTests extends CatsSuite {
import StateTTests._
Expand Down Expand Up @@ -294,15 +294,10 @@ object StateTTests extends StateTTestsInstances {
implicit def stateEq[S:Eq:Arbitrary, A:Eq]: Eq[State[S, A]] =
stateTEq[Eval, S, A]

implicit def stateArbitrary[S: Arbitrary: Cogen, A: Arbitrary]: Arbitrary[State[S, A]] =
stateTArbitrary[Eval, S, A]

val add1: State[Int, Int] = State(n => (n + 1, n))
}

sealed trait StateTTestsInstances {
implicit def stateTArbitrary[F[_]: Applicative, S, A](implicit F: Arbitrary[S => F[(S, A)]]): Arbitrary[StateT[F, S, A]] =
Arbitrary(F.arbitrary.map(f => StateT(f)))

implicit def stateTEq[F[_], S, A](implicit S: Arbitrary[S], FSA: Eq[F[(S, A)]], F: FlatMap[F]): Eq[StateT[F, S, A]] =
Eq.by[StateT[F, S, A], S => F[(S, A)]](state =>
Expand Down