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

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

package cats
package laws
package discipline

import cats.arrow.Category
import org.scalacheck.Arbitrary
import org.scalacheck.Prop
import Prop._

trait CategoryTests[F[_, _]] extends ComposeTests[F] {
  def laws: CategoryLaws[F]

  def category[A, B, C, D](implicit
    ArbFAB: Arbitrary[F[A, B]],
    ArbFBC: Arbitrary[F[B, C]],
    ArbFCD: Arbitrary[F[C, D]],
    EqFAB: Eq[F[A, B]],
    EqFAD: Eq[F[A, D]]
  ): RuleSet =
    new DefaultRuleSet(
      name = "category",
      parent = Some(compose[A, B, C, D]),
      "category left identity" -> forAll(laws.categoryLeftIdentity[A, B] _),
      "category right identity" -> forAll(laws.categoryRightIdentity[A, B] _))
}

object CategoryTests {
  def apply[F[_, _]: Category]: CategoryTests[F] =
    new CategoryTests[F] { def laws: CategoryLaws[F] = CategoryLaws[F] }
}