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-rw-r--r--test/scalacheck/CheckEither.scala243
1 files changed, 243 insertions, 0 deletions
diff --git a/test/scalacheck/CheckEither.scala b/test/scalacheck/CheckEither.scala
new file mode 100644
index 0000000000..48b90c1d9b
--- /dev/null
+++ b/test/scalacheck/CheckEither.scala
@@ -0,0 +1,243 @@
+import org.scalacheck.{ Arbitrary, Prop, Properties }
+import org.scalacheck.Arbitrary.{arbitrary, arbThrowable}
+import org.scalacheck.Gen.oneOf
+import org.scalacheck.Prop._
+import org.scalacheck.Test.check
+import Function.tupled
+
+object CheckEitherTest extends Properties("Either") {
+ implicit def arbitraryEither[X, Y](implicit xa: Arbitrary[X], ya: Arbitrary[Y]): Arbitrary[Either[X, Y]] =
+ Arbitrary[Either[X, Y]](oneOf(arbitrary[X].map(Left(_)), arbitrary[Y].map(Right(_))))
+
+ val prop_either1 = forAll((n: Int) => Left(n).fold(x => x, b => sys.error("fail")) == n)
+
+ val prop_either2 = forAll((n: Int) => Right(n).fold(a => sys.error("fail"), x => x) == n)
+
+ val prop_swap = forAll((e: Either[Int, Int]) => e match {
+ case Left(a) => e.swap.right.get == a
+ case Right(b) => e.swap.left.get == b
+ })
+
+ val prop_isLeftRight = forAll((e: Either[Int, Int]) => e.isLeft != e.isRight)
+
+ object CheckLeftProjection {
+ val prop_value = forAll((n: Int) => Left(n).left.get == n)
+
+ val prop_getOrElse = forAll((e: Either[Int, Int], or: Int) => e.left.getOrElse(or) == (e match {
+ case Left(a) => a
+ case Right(_) => or
+ }))
+
+ val prop_forall = forAll((e: Either[Int, Int]) =>
+ e.left.forall(_ % 2 == 0) == (e.isRight || e.left.get % 2 == 0))
+
+ val prop_exists = forAll((e: Either[Int, Int]) =>
+ e.left.exists(_ % 2 == 0) == (e.isLeft && e.left.get % 2 == 0))
+
+ val prop_flatMapLeftIdentity = forAll((e: Either[Int, Int], n: Int, s: String) => {
+ def f(x: Int) = if(x % 2 == 0) Left(s) else Right(s)
+ Left(n).left.flatMap(f(_)) == f(n)})
+
+ val prop_flatMapRightIdentity = forAll((e: Either[Int, Int]) => e.left.flatMap(Left(_)) == e)
+
+ val prop_flatMapComposition = forAll((e: Either[Int, Int]) => {
+ def f(x: Int) = if(x % 2 == 0) Left(x) else Right(x)
+ def g(x: Int) = if(x % 7 == 0) Right(x) else Left(x)
+ e.left.flatMap(f(_)).left.flatMap(g(_)) == e.left.flatMap(f(_).left.flatMap(g(_)))})
+
+ val prop_mapIdentity = forAll((e: Either[Int, Int]) => e.left.map(x => x) == e)
+
+ val prop_mapComposition = forAll((e: Either[String, Int]) => {
+ def f(s: String) = s.toLowerCase
+ def g(s: String) = s.reverse
+ e.left.map(x => f(g(x))) == e.left.map(x => g(x)).left.map(f(_))})
+
+ val prop_filter = forAll((e: Either[Int, Int], x: Int) => e.left.filter(_ % 2 == 0) ==
+ (if(e.isRight || e.left.get % 2 != 0) None else Some(e)))
+
+ val prop_seq = forAll((e: Either[Int, Int]) => e.left.toSeq == (e match {
+ case Left(a) => Seq(a)
+ case Right(_) => Seq.empty
+ }))
+
+ val prop_option = forAll((e: Either[Int, Int]) => e.left.toOption == (e match {
+ case Left(a) => Some(a)
+ case Right(_) => None
+ }))
+ }
+
+ object CheckRightProjection {
+ val prop_value = forAll((n: Int) => Right(n).right.get == n)
+
+ val prop_getOrElse = forAll((e: Either[Int, Int], or: Int) => e.right.getOrElse(or) == (e match {
+ case Left(_) => or
+ case Right(b) => b
+ }))
+
+ val prop_forall = forAll((e: Either[Int, Int]) =>
+ e.right.forall(_ % 2 == 0) == (e.isLeft || e.right.get % 2 == 0))
+
+ val prop_exists = forAll((e: Either[Int, Int]) =>
+ e.right.exists(_ % 2 == 0) == (e.isRight && e.right.get % 2 == 0))
+
+ val prop_flatMapLeftIdentity = forAll((e: Either[Int, Int], n: Int, s: String) => {
+ def f(x: Int) = if(x % 2 == 0) Left(s) else Right(s)
+ Right(n).right.flatMap(f(_)) == f(n)})
+
+ val prop_flatMapRightIdentity = forAll((e: Either[Int, Int]) => e.right.flatMap(Right(_)) == e)
+
+ val prop_flatMapComposition = forAll((e: Either[Int, Int]) => {
+ def f(x: Int) = if(x % 2 == 0) Left(x) else Right(x)
+ def g(x: Int) = if(x % 7 == 0) Right(x) else Left(x)
+ e.right.flatMap(f(_)).right.flatMap(g(_)) == e.right.flatMap(f(_).right.flatMap(g(_)))})
+
+ val prop_mapIdentity = forAll((e: Either[Int, Int]) => e.right.map(x => x) == e)
+
+ val prop_mapComposition = forAll((e: Either[Int, String]) => {
+ def f(s: String) = s.toLowerCase
+ def g(s: String) = s.reverse
+ e.right.map(x => f(g(x))) == e.right.map(x => g(x)).right.map(f(_))})
+
+ val prop_filter = forAll((e: Either[Int, Int], x: Int) => e.right.filter(_ % 2 == 0) ==
+ (if(e.isLeft || e.right.get % 2 != 0) None else Some(e)))
+
+ val prop_seq = forAll((e: Either[Int, Int]) => e.right.toSeq == (e match {
+ case Left(_) => Seq.empty
+ case Right(b) => Seq(b)
+ }))
+
+ val prop_option = forAll((e: Either[Int, Int]) => e.right.toOption == (e match {
+ case Left(_) => None
+ case Right(b) => Some(b)
+ }))
+ }
+
+ val prop_Either_left = forAll((n: Int) => Left(n).left.get == n)
+
+ val prop_Either_right = forAll((n: Int) => Right(n).right.get == n)
+
+ val prop_Either_joinLeft = forAll((e: Either[Either[Int, Int], Int]) => e match {
+ case Left(ee) => e.joinLeft == ee
+ case Right(n) => e.joinLeft == Right(n)
+ })
+
+ val prop_Either_joinRight = forAll((e: Either[Int, Either[Int, Int]]) => e match {
+ case Left(n) => e.joinRight == Left(n)
+ case Right(ee) => e.joinRight == ee
+ })
+
+ val prop_Either_reduce = forAll((e: Either[Int, Int]) =>
+ e.merge == (e match {
+ case Left(a) => a
+ case Right(a) => a
+ }))
+
+ val prop_getOrElse = forAll((e: Either[Int, Int], or: Int) => e.getOrElse(or) == (e match {
+ case Left(_) => or
+ case Right(b) => b
+ }))
+
+ val prop_contains = forAll((e: Either[Int, Int], n: Int) =>
+ e.contains(n) == (e.isRight && e.right.get == n))
+
+ val prop_forall = forAll((e: Either[Int, Int]) =>
+ e.forall(_ % 2 == 0) == (e.isLeft || e.right.get % 2 == 0))
+
+ val prop_exists = forAll((e: Either[Int, Int]) =>
+ e.exists(_ % 2 == 0) == (e.isRight && e.right.get % 2 == 0))
+
+ val prop_flatMapLeftIdentity = forAll((e: Either[Int, Int], n: Int, s: String) => {
+ def f(x: Int) = if(x % 2 == 0) Left(s) else Right(s)
+ Right(n).flatMap(f(_)) == f(n)})
+
+ val prop_flatMapRightIdentity = forAll((e: Either[Int, Int]) => e.flatMap(Right(_)) == e)
+
+ val prop_flatMapComposition = forAll((e: Either[Int, Int]) => {
+ def f(x: Int) = if(x % 2 == 0) Left(x) else Right(x)
+ def g(x: Int) = if(x % 7 == 0) Right(x) else Left(x)
+ e.flatMap(f(_)).flatMap(g(_)) == e.flatMap(f(_).flatMap(g(_)))})
+
+ val prop_mapIdentity = forAll((e: Either[Int, Int]) => e.map(x => x) == e)
+
+ val prop_mapComposition = forAll((e: Either[Int, String]) => {
+ def f(s: String) = s.toLowerCase
+ def g(s: String) = s.reverse
+ e.map(x => f(g(x))) == e.map(x => g(x)).map(f(_))})
+
+ val prop_filterOrElse = forAll((e: Either[Int, Int], x: Int) => e.filterOrElse(_ % 2 == 0, -x) ==
+ (if(e.isLeft) e
+ else if(e.right.get % 2 == 0) e
+ else Left(-x)))
+
+ val prop_seq = forAll((e: Either[Int, Int]) => e.toSeq == (e match {
+ case Left(_) => collection.immutable.Seq.empty
+ case Right(b) => collection.immutable.Seq(b)
+ }))
+
+ val prop_option = forAll((e: Either[Int, Int]) => e.toOption == (e match {
+ case Left(_) => None
+ case Right(b) => Some(b)
+ }))
+
+ val prop_try = forAll((e: Either[Throwable, Int]) => e.toTry == (e match {
+ case Left(a) => util.Failure(a)
+ case Right(b) => util.Success(b)
+ }))
+
+ /** Hard to believe I'm "fixing" a test to reflect B before A ... */
+ val prop_Either_cond = forAll((c: Boolean, a: Int, b: Int) =>
+ Either.cond(c, a, b) == (if(c) Right(a) else Left(b)))
+
+ val tests = List(
+ ("prop_either1", prop_either1),
+ ("prop_either2", prop_either2),
+ ("prop_swap", prop_swap),
+ ("prop_isLeftRight", prop_isLeftRight),
+ ("Left.prop_value", CheckLeftProjection.prop_value),
+ ("Left.prop_getOrElse", CheckLeftProjection.prop_getOrElse),
+ ("Left.prop_forall", CheckLeftProjection.prop_forall),
+ ("Left.prop_exists", CheckLeftProjection.prop_exists),
+ ("Left.prop_flatMapLeftIdentity", CheckLeftProjection.prop_flatMapLeftIdentity),
+ ("Left.prop_flatMapRightIdentity", CheckLeftProjection.prop_flatMapRightIdentity),
+ ("Left.prop_flatMapComposition", CheckLeftProjection.prop_flatMapComposition),
+ ("Left.prop_mapIdentity", CheckLeftProjection.prop_mapIdentity),
+ ("Left.prop_mapComposition", CheckLeftProjection.prop_mapComposition),
+ ("Left.prop_filter", CheckLeftProjection.prop_filter),
+ ("Left.prop_seq", CheckLeftProjection.prop_seq),
+ ("Left.prop_option", CheckLeftProjection.prop_option),
+ ("Right.prop_value", CheckRightProjection.prop_value),
+ ("Right.prop_getOrElse", CheckRightProjection.prop_getOrElse),
+ ("Right.prop_forall", CheckRightProjection.prop_forall),
+ ("Right.prop_exists", CheckRightProjection.prop_exists),
+ ("Right.prop_flatMapLeftIdentity", CheckRightProjection.prop_flatMapLeftIdentity),
+ ("Right.prop_flatMapRightIdentity", CheckRightProjection.prop_flatMapRightIdentity),
+ ("Right.prop_flatMapComposition", CheckRightProjection.prop_flatMapComposition),
+ ("Right.prop_mapIdentity", CheckRightProjection.prop_mapIdentity),
+ ("Right.prop_mapComposition", CheckRightProjection.prop_mapComposition),
+ ("Right.prop_filter", CheckRightProjection.prop_filter),
+ ("Right.prop_seq", CheckRightProjection.prop_seq),
+ ("Right.prop_option", CheckRightProjection.prop_option),
+ ("prop_Either_left", prop_Either_left),
+ ("prop_Either_right", prop_Either_right),
+ ("prop_Either_joinLeft", prop_Either_joinLeft),
+ ("prop_Either_joinRight", prop_Either_joinRight),
+ ("prop_Either_reduce", prop_Either_reduce),
+ ("prop_getOrElse", prop_getOrElse),
+ ("prop_contains", prop_contains),
+ ("prop_forall", prop_forall),
+ ("prop_exists", prop_exists),
+ ("prop_flatMapLeftIdentity", prop_flatMapLeftIdentity),
+ ("prop_flatMapRightIdentity", prop_flatMapRightIdentity),
+ ("prop_flatMapComposition", prop_flatMapComposition),
+ ("prop_mapIdentity", prop_mapIdentity),
+ ("prop_mapComposition", prop_mapComposition),
+ ("prop_filterOrElse", prop_filterOrElse),
+ ("prop_seq", prop_seq),
+ ("prop_option", prop_option),
+ ("prop_try", prop_try),
+ ("prop_Either_cond", prop_Either_cond))
+
+ for ((label, prop) <- tests) {
+ property(label) = prop
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-03 23:15:10 +0000