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Improving test coverage #962

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Mar 29, 2016
Merged

Improving test coverage #962

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7 changes: 7 additions & 0 deletions jvm/src/test/scala/cats/tests/FutureTests.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ package tests

import cats.data.Xor
import cats.laws.discipline._
import cats.laws.discipline.arbitrary.evalArbitrary
import cats.laws.discipline.eq.tuple3Eq
import cats.jvm.std.future.futureComonad
import cats.tests.CatsSuite
Expand Down Expand Up @@ -40,4 +41,10 @@ class FutureTests extends CatsSuite {

checkAll("Future[Int]", MonadErrorTests[Future, Throwable].monadError[Int, Int, Int])
checkAll("Future[Int]", ComonadTests[Future].comonad[Int, Int, Int])

test("pureEval lifts a potentially lazy value into Future") {
forAll { e: Eval[Int] =>
e.pureEval[Future].extract should === (e.value)
}
}
}
22 changes: 22 additions & 0 deletions tests/src/test/scala/cats/tests/FunctorTests.scala
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Expand Up @@ -5,6 +5,7 @@ import cats.data.Xor
import cats.functor.Contravariant
import cats.laws.discipline.{ContravariantTests, FunctorTests, SerializableTests}
import cats.laws.discipline.arbitrary._
import cats.laws.discipline.eq._
import cats.laws.discipline.eq.showEq

class FunctorTest extends CatsSuite {
Expand All @@ -15,9 +16,30 @@ class FunctorTest extends CatsSuite {
checkAll("Option compose Xor", FunctorTests(optionXorFunctor).functor[Int, Int, Int])
checkAll("Functor[Option compose Xor]", SerializableTests.serializable(optionXorFunctor))

val optionComposeWithFunctorXor: Functor[OptionXor] =
Functor[Option].composeWithFunctor[Xor[String, ?]]
checkAll("Option composeWithFunctor Xor", FunctorTests(optionComposeWithFunctorXor).functor[Int, Int, Int])
checkAll("Functor[Option composeWithFunctor Xor]", SerializableTests.serializable(optionComposeWithFunctorXor))

type OptionShow[A] = Option[Show[A]]
val optionShowContravariant: Contravariant[OptionShow] =
Functor[Option].composeWithContravariant[Show]
checkAll("Option composeWithContravariant Show", ContravariantTests(optionShowContravariant).contravariant[Int, Int, Int])
checkAll("Contravariant[Option composeWithContravariant Show]", SerializableTests.serializable(optionShowContravariant))

test("void replaces values with unit preserving structure") {
forAll { (l: List[Int], o: Option[Int], m: Map[String, Int]) =>
l.void should === (List.fill(l.length)(()))
o.void should === (if (o.nonEmpty) Some(()) else None)
m.void should === (m.keys.map(k => (k, ())).toMap)
}
}

test("as replaces values with a constant value preserving structure") {
forAll { (l: List[Int], o: Option[Int], m: Map[String, Int], i: Int) =>
l.as(i) should === (List.fill(l.length)(i))
o.as(i) should === (if (o.nonEmpty) Some(i) else None)
m.as(i) should === (m.keys.map(k => (k, i)).toMap)
}
}
}