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Adds additional tests for Option T #692

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Nov 24, 2015
Merged

Adds additional tests for Option T #692

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16 changes: 14 additions & 2 deletions tests/src/test/scala/cats/tests/OptionTTests.scala
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
package cats.tests

import cats.{Applicative, Id, Monad}
import cats.{Applicative, Id, Monad, Show}
import cats.data.{OptionT, Validated, Xor}
import cats.laws.discipline.{ApplicativeTests, FunctorTests, MonadCombineTests, SerializableTests}
import cats.laws.discipline.arbitrary._
Expand Down Expand Up @@ -81,6 +81,12 @@ class OptionTTests extends CatsSuite {
}
}

test("flatMap and flatMapF consistent") {
forAll { (optionT: OptionT[List, Int], f: Int => OptionT[List, Int]) =>
optionT.flatMap(f) should === (optionT.flatMapF(f(_).value))
}
}

test("OptionT[Id, A].toRight consistent with Xor.fromOption") {
forAll { (o: OptionT[Id, Int], s: String) =>
o.toRight(s).value should === (Xor.fromOption(o.value, s))
Expand Down Expand Up @@ -117,11 +123,17 @@ class OptionTTests extends CatsSuite {
}
}

test("show"){
test("show") {
val xor: String Xor Option[Int] = Xor.right(Some(1))
OptionT[Xor[String, ?], Int](xor).show should === ("Xor.Right(Some(1))")
}

test("implicit Show[OptionT] instance and explicit show method are consistent") {
forAll { optionT: OptionT[List, Int] =>
optionT.show should === (implicitly[Show[OptionT[List, Int]]].show(optionT))
}
}

test("transform consistent with value.map") {
forAll { (o: OptionT[List, Int], f: Option[Int] => Option[String]) =>
o.transform(f) should === (OptionT(o.value.map(f)))
Expand Down