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import scala.util.{Try, Success, Failure}
// tests the basic combinators on Try
trait TryStandard {
def testForeachSuccess(): Unit = {
val t = Success(1)
var res = 0
t.foreach(x => res = x * 10)
assert(res == 10)
}
def testForeachFailure(): Unit = {
val t = Failure(new Exception("foo"))
t.foreach(x => assert(false))
}
def testFlatMapSuccess(): Unit = {
val t = Success(1)
val n = t.flatMap(x => Try(x * 10))
assert(n.get == 10)
}
def testFlatMapFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.flatMap{ x => assert(false); Try() }
}
def testMapSuccess(): Unit = {
val t = Success(1)
val n = t.map(x => x * 10)
assert(n.get == 10)
}
def testMapFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.map(x => assert(false))
}
def testFilterSuccessTrue(): Unit = {
val t = Success(1)
val n = t.filter(x => x > 0)
assert(n.get == 1)
}
def testFilterSuccessFalse(): Unit = {
val t = Success(1)
val n = t.filter(x => x < 0)
n match {
case Success(v) => assert(false)
case Failure(e: NoSuchElementException) => assert(true)
}
}
def testFilterFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.filter{ x => assert(false); true }
}
def testRescueSuccess(): Unit = {
val t = Success(1)
t.rescue{ case x => assert(false); Try() }
}
def testRescueFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.rescue{ case x => Try(1) }
assert(n.get == 1)
}
def testRecoverSuccess(): Unit = {
val t = Success(1)
t.recover{ case x => assert(false); 99 }
}
def testRecoverFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.recover{ case x => 1 }
assert(n.get == 1)
}
def testFlattenSuccess(): Unit = {
val f = Failure(new Exception("foo"))
val t = Success(f)
assert(t.flatten == f)
}
def testFailedSuccess(): Unit = {
val t = Success(1)
val n = t.failed
n match {
case Failure(e: UnsupportedOperationException) => assert(true)
case _ => assert(false)
}
}
def testFailedFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.failed
n match {
case Success(e: Exception) => assert(true)
case _ => assert(false)
}
}
testForeachSuccess()
testForeachFailure()
testFlatMapSuccess()
testFlatMapFailure()
testMapSuccess()
testMapFailure()
testFilterSuccessTrue()
testFilterSuccessFalse()
testFilterFailure()
testRescueSuccess()
testRescueFailure()
testRecoverSuccess()
testRecoverFailure()
testFlattenSuccess()
testFailedSuccess()
testFailedFailure()
}
// tests that implicit conversions from Try to Either behave as expected
trait TryImplicitConversionTry2Either {
def testTry2RightMap(): Unit = {
val t = Success(1)
val n = t.right.map(x => x * 100)
assert(n == Right(100))
}
def testTry2LeftMap(): Unit = {
val e = new Exception("foo")
val t = Failure(e)
val n = t.left.map(x => x)
assert(n == Left(e))
}
def testTry2FoldSuccess(): Unit = {
val t = Success(1)
val n = t.fold(x => assert(false), y => y * 200)
assert(n == 200)
}
def testTry2FoldFailure(): Unit = {
val e = new Exception("foo")
val t = Failure(e)
val n = t.fold(x => x, y => assert(false))
assert(n == e)
}
def testTry2SwapSuccess(): Unit = {
val t = Success(1)
val n = t.swap
assert(n == Left(1))
}
def testTry2SwapFailure(): Unit = {
val e = new Exception("foo")
val t = Failure(e)
val n = t.swap
assert(n == Right(e))
}
// def testTry2MergeSucccess(): Unit = {
// val t: Try[Int] = Success(1)
// val n = (t: Either[Any, Any]).t.merge // connecting two implicit conversions
// assert(n == 1)
// }
// def testTry2MergeFailure(): Unit = {
// val e = new Exception("foo")
// val t = Failure(e)
// val n = (t: Either[Any, Any]).merge // connecting two implicit conversions
// assert(n == e)
// }
testTry2RightMap()
testTry2LeftMap()
testTry2FoldSuccess()
testTry2FoldFailure()
testTry2SwapSuccess()
testTry2SwapFailure()
// testTry2MergeSucccess()
// testTry2MergeFailure()
}
// tests that implicit conversions from Either to Try behave as expected
trait TryImplicitConversionEither2Try {
def testRight2FilterSuccessTrue(): Unit = {
def expectsTry[U <% Try[Int]](rght: U): Try[Int] = {
val n = rght.filter(x => x > 0) // this should be converted to a Try
n
}
val r = Right(1)
val n = expectsTry(r)
assert(n == Success(1))
}
def testRight2FilterSuccessFalse(): Unit = {
def expectsTry[U <% Try[Int]](rght: U): Try[Int] = {
val n = rght.filter(x => x < 0) // this should be converted to a Try
n
}
val r = Right(1)
val n = expectsTry(r)
n match {
case Failure(e: NoSuchElementException) => assert(true)
case _ => assert(false)
}
}
def testLeft2FilterFailure(): Unit = {
def expectsTry[U <% Try[Int]](rght: U): Try[Int] = {
val n = rght.filter(x => x > 0) // this should be converted to a Try
n
}
val r = Left(new Exception("foo"))
val n = expectsTry(r)
n match {
case Failure(e: Exception) => assert(true)
case _ => assert(false)
}
}
def testRight2GetSuccess(): Unit = {
def expectsTry[U <% Try[Int]](rght: U): Int = {
val n = rght.get // this should be converted to a Try
n
}
val r = Right(1)
val n = expectsTry(r)
assert(n == 1)
}
testRight2FilterSuccessTrue()
testRight2FilterSuccessFalse()
testLeft2FilterFailure()
testRight2GetSuccess()
}
object Test
extends App
with TryStandard
with TryImplicitConversionTry2Either
with TryImplicitConversionEither2Try {
System.exit(0)
}
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