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Add labels to prop produced from IsEq #2052

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Nov 29, 2017
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Add labels to prop produced from IsEq #2052

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11 changes: 9 additions & 2 deletions kernel-laws/src/main/scala/cats/kernel/laws/discipline/package.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,15 @@ package cats.kernel.laws

import cats.kernel.Eq
import org.scalacheck.Prop
import org.scalacheck.util.Pretty

package object discipline {
implicit def catsLawsIsEqToProp[A](isEq: IsEq[A])(implicit ev: Eq[A]): Prop =
ev.eqv(isEq.lhs, isEq.rhs)
implicit def catsLawsIsEqToProp[A](isEq: IsEq[A])(implicit ev: Eq[A], pp: A => Pretty): Prop =
isEq match { case IsEq(x, y) =>
if (ev.eqv(x, y)) Prop.proved else Prop.falsified :| {
val exp = Pretty.pretty[A](y, Pretty.Params(0))
val act = Pretty.pretty[A](x, Pretty.Params(0))
s"Expected: $exp\n" + s"Received: $act"
}
}
}
3 changes: 2 additions & 1 deletion laws/src/main/scala/cats/laws/discipline/package.scala
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Expand Up @@ -2,11 +2,12 @@ package cats
package laws

import org.scalacheck.Prop
import org.scalacheck.util.Pretty

package object discipline {

val SerializableTests = cats.kernel.laws.discipline.SerializableTests

implicit def catsLawsIsEqToProp[A: Eq](isEq: IsEq[A]): Prop =
implicit def catsLawsIsEqToProp[A: Eq](isEq: IsEq[A])(implicit pp: A => Pretty): Prop =
cats.kernel.laws.discipline.catsLawsIsEqToProp[A](isEq)
}