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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)
case _ => assert(false)
}
}
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.recoverWith{ case x => assert(false); Try(()) }
}
def testRescueFailure(): Unit = {
val t = Failure(new Exception("foo"))
val n = t.recoverWith{ 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)
}
}
def testSuccessTransform(): Unit = {
val s = Success(1)
val succ = (x: Int) => Success(x * 10)
val fail = (x: Throwable) => Success(0)
assert(s.transform(succ, fail).get == 10)
}
def testFailureTransform(): Unit = {
val f = Failure(new Exception("foo"))
val succ = (x: Int) => Success(x * 10)
val fail = (x: Throwable) => Success(0)
assert(f.transform(succ, fail).get == 0)
}
def testSuccessEither(): Unit = {
val t = Success(1)
assert(t.toEither.isRight)
}
def testFailureEither(): Unit = {
val t = Failure(new Exception("foo"))
assert(t.toEither.isLeft)
}
def testFoldSuccess(): Unit = {
val t = Success(1)
val res = t.fold("Throws " + _, "Returns " + _)
assert(res == "Returns 1")
}
def testFoldFailure(): Unit = {
val t = Failure(new Exception("foo"))
val res = t.fold("Throws " + _, "Returns " + _)
assert(res == "Throws java.lang.Exception: foo")
}
def testFoldSuccessFailure(): Unit = {
val t = Success(1)
val res = t.fold("Throws " + _, _ => throw new Exception("foo"))
assert(res == "Throws java.lang.Exception: foo")
}
def testFoldFailureFailure(): Unit = {
val t = Failure(new Exception("foo"))
val res = try {
t.fold(_ => throw new Exception("bar"), "Returns " + _)
} catch {
case e: Throwable => "Throws " + e
}
assert(res == "Throws java.lang.Exception: bar")
}
testForeachSuccess()
testForeachFailure()
testFlatMapSuccess()
testFlatMapFailure()
testMapSuccess()
testMapFailure()
testFilterSuccessTrue()
testFilterSuccessFalse()
testFilterFailure()
testRescueSuccess()
testRescueFailure()
testRecoverSuccess()
testRecoverFailure()
testFlattenSuccess()
testFailedSuccess()
testFailedFailure()
testSuccessTransform()
testFailureTransform()
testSuccessEither()
testFailureEither()
testFoldSuccess()
testFoldFailure()
testFoldSuccessFailure()
}
object Test
extends App
with TryStandard {
System.exit(0)
}
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