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• cats-laws_2.10
• 0.3.0
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• ComposeTests.scala

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cats.laws.discipline.ComposeTests.scala Maven / Gradle / Ivy

package cats
package laws
package discipline

import cats.arrow.Compose
import org.scalacheck.Arbitrary
import org.scalacheck.Prop
import Prop._
import org.typelevel.discipline.Laws

trait ComposeTests[F[_, _]] extends Laws {
  def laws: ComposeLaws[F]

  def compose[A, B, C, D](implicit
    ArbFAB: Arbitrary[F[A, B]],
    ArbFBC: Arbitrary[F[B, C]],
    ArbFCD: Arbitrary[F[C, D]],
    EqFAD: Eq[F[A, D]]
  ): RuleSet =
    new DefaultRuleSet(
      name = "compose",
      parent = None,
      "compose associativity" -> forAll(laws.composeAssociativity[A, B, C, D] _))
}

object ComposeTests {
  def apply[F[_, _]: Compose]: ComposeTests[F] =
    new ComposeTests[F] { def laws: ComposeLaws[F] = ComposeLaws[F] }
}