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51 changes: 51 additions & 0 deletions
51
parsley-cats/shared/src/test/scala/parsley/CatsSuite.scala
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| package parsley | ||
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| import org.scalatest.flatspec.AnyFlatSpec | ||
| import org.scalatest.matchers.should.Matchers._ | ||
| import org.scalactic.source.Position | ||
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| import parsley.character.{item, digit, char} | ||
| import parsley.catsinstances._ | ||
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| import cats.laws.{MonadLaws, MonoidKLaws, FunctorFilterLaws} | ||
| import cats.kernel.laws.IsEq | ||
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| // TODO: More laws! | ||
| class CatsSuite extends AnyFlatSpec { | ||
| val monadLaws = MonadLaws[Parsley] | ||
| val monoidKLaws = MonoidKLaws[Parsley] | ||
| val filterFunctorLaws = FunctorFilterLaws[Parsley] | ||
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| def applyLaw[A](law: IsEq[Parsley[A]]*)(inputs: String*)(implicit pos: Position): Unit = { | ||
| for (IsEq(p1, p2) <- law; input <- inputs) { | ||
| p1.parse(input) shouldBe p2.parse(input) | ||
| } | ||
| } | ||
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| "Functor" should "adhere to laws" in { | ||
| applyLaw(monadLaws.covariantIdentity(item))("", "a", "b") | ||
| applyLaw(monadLaws.covariantComposition[Char, Int, Int](digit, _.asDigit, _ + 1))("", "0", "4", "a") | ||
| } | ||
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| "Applicative" should "adhere to laws" in { | ||
| applyLaw(monadLaws.applicativeIdentity(item))("", "a", "b") | ||
| applyLaw(monadLaws.applicativeHomomorphism[Int, Int](5, _ + 1))("", "a") | ||
| applyLaw(monadLaws.applicativeInterchange[Int, String](7, item #> (_.toString)))("", "a", "b") | ||
| applyLaw(monadLaws.applicativeMap[Char, Int](digit, _.asDigit))("", "0", "4") | ||
| } | ||
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| "FilterFunctor" should "adhere to laws" in { | ||
| applyLaw(filterFunctorLaws.mapFilterComposition[Char, Int, Int]( | ||
| item, | ||
| c => Option.when(c.isDigit)(c.asDigit), | ||
| x => Option.when(x % 2 == 0)(x/2)))("", "a", "0", "8") | ||
| applyLaw(filterFunctorLaws.filterConsistentWithMapFilter[Char]( | ||
| item, | ||
| _.isDigit))("", "a", "0", "8") | ||
| } | ||
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| "MonoidK" should "adhere to laws" in { | ||
| applyLaw(monoidKLaws.monoidKLeftIdentity(item), monoidKLaws.monoidKRightIdentity(item))("", "a", "b") | ||
| applyLaw(monoidKLaws.combineAllK(Vector(char('a'), char('b'), char('c'))))("", "a", "b", "c") | ||
| } | ||
| } |