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IsEq.scala
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IsEq.scala
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/*
* Copyright 2020-2022 Typelevel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cats.effect.laws
import cats.{Applicative, Eq, Group, Order}
import cats.syntax.all._
import org.scalacheck.Prop
import org.scalacheck.util.Pretty
sealed trait IsEq[A] {
def toPropTolerant[F[_], B](
implicit ev: A =:= F[B],
F: Applicative[F],
ord: Order[F[B]],
g: Group[B],
tolerance: Tolerance[B],
pp: A => Pretty): Prop =
this match {
case IsEq.Assert(lhs0, rhs0) =>
val lhs = ev(lhs0)
val rhs = ev(rhs0)
if (lhs <= rhs && (rhs, lhs).mapN(_ |-| _) <= tolerance.value.pure[F]) {
Prop.proved
} else if (lhs > rhs && (lhs, rhs).mapN(_ |-| _) <= tolerance.value.pure[F]) {
Prop.proved
} else {
Prop.falsified :| {
val exp = Pretty.pretty[A](rhs0, Pretty.Params(0))
val act = Pretty.pretty[A](lhs0, Pretty.Params(0))
s"Expected: $exp ± ${tolerance.value}\n" + s"Received: $act"
}
}
}
def toProp(implicit A: Eq[A], pp: A => Pretty): Prop =
this match {
case IsEq.Assert(lhs, rhs) =>
try {
cats.laws.discipline.catsLawsIsEqToProp(cats.laws.IsEq(lhs, rhs))
} catch {
case soe: StackOverflowError =>
soe.printStackTrace()
throw soe
}
}
}
private[laws] trait IsEqLowPriorityImplicits {
implicit def toProp[A: Eq](isEq: IsEq[A])(implicit pp: A => Pretty): Prop =
isEq.toProp
}
object IsEq extends IsEqLowPriorityImplicits {
implicit def toPropTolerant[F[_], A](isEq: IsEq[F[A]])(
implicit F: Applicative[F],
ord: Order[F[A]],
g: Group[A],
tolerance: Tolerance[A],
pp: F[A] => Pretty): Prop =
isEq.toPropTolerant
def apply[A](lhs: A, rhs: A): IsEq[A] =
Assert(lhs, rhs)
final case class Assert[A](lhs: A, rhs: A) extends IsEq[A]
}