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object Test {
def main(args: Array[String]): Unit = {
val test = scala.reflect.internal.util.WeakHashSetTest
test.checkEmpty
test.checkPlusEquals
test.checkPlusEqualsCollisions
test.checkRehashing
test.checkRehashCollisions
test.checkFindOrUpdate
test.checkMinusEquals
test.checkMinusEqualsCollisions
test.checkClear
test.checkIterator
test.checkIteratorCollisions
// This test is commented out because it relies on gc behavior which isn't reliable enough in an automated environment
// test.checkRemoveUnreferencedObjects
}
}
// put the main test object in the same package as WeakHashSet because
// it uses the package private "diagnostics" method
package scala.reflect.internal.util {
object WeakHashSetTest {
// a class guaranteed to provide hash collisions
case class Collider(x : String) extends Comparable[Collider] with Serializable {
override def hashCode = 0
def compareTo(y : Collider) = this.x compareTo y.x
}
// basic emptiness check
def checkEmpty: Unit = {
val hs = new WeakHashSet[String]()
assert(hs.size == 0)
hs.diagnostics.fullyValidate
}
// make sure += works
def checkPlusEquals: Unit = {
val hs = new WeakHashSet[String]()
val elements = List("hello", "goodbye")
elements foreach (hs += _)
assert(hs.size == 2)
assert(hs contains "hello")
assert(hs contains "goodbye")
hs.diagnostics.fullyValidate
}
// make sure += works when there are collisions
def checkPlusEqualsCollisions: Unit = {
val hs = new WeakHashSet[Collider]()
val elements = List("hello", "goodbye") map Collider
elements foreach (hs += _)
assert(hs.size == 2)
assert(hs contains Collider("hello"))
assert(hs contains Collider("goodbye"))
hs.diagnostics.fullyValidate
}
// add a large number of elements to force rehashing and then validate
def checkRehashing: Unit = {
val size = 200
val hs = new WeakHashSet[String]()
val elements = (0 until size).toList map ("a" + _)
elements foreach (hs += _)
elements foreach {i => assert(hs contains i)}
hs.diagnostics.fullyValidate
}
// make sure rehashing works properly when the set is rehashed
def checkRehashCollisions: Unit = {
val size = 200
val hs = new WeakHashSet[Collider]()
val elements = (0 until size).toList map {x => Collider("a" + x)}
elements foreach (hs += _)
elements foreach {i => assert(hs contains i)}
hs.diagnostics.fullyValidate
}
// test that unreferenced objects are removed
// not run in an automated environment because gc behavior can't be relied on
def checkRemoveUnreferencedObjects: Unit = {
val size = 200
val hs = new WeakHashSet[Collider]()
val elements = (0 until size).toList map {x => Collider("a" + x)}
elements foreach (hs += _)
// don't throw the following into a retained collection so gc
// can remove them
for (i <- 0 until size) {
hs += Collider("b" + i)
}
System.gc()
Thread.sleep(1000)
assert(hs.size == 200)
elements foreach {i => assert(hs contains i)}
for (i <- 0 until size) {
assert(!(hs contains Collider("b" + i)))
}
hs.diagnostics.fullyValidate
}
// make sure findOrUpdate returns the originally entered element
def checkFindOrUpdate: Unit = {
val size = 200
val hs = new WeakHashSet[Collider]()
val elements = (0 until size).toList map {x => Collider("a" + x)}
elements foreach {x => assert(hs findEntryOrUpdate x eq x)}
for (i <- 0 until size) {
// when we do a lookup the result should be the same reference we
// original put in
assert(hs findEntryOrUpdate(Collider("a" + i)) eq elements(i))
}
hs.diagnostics.fullyValidate
}
// check -= functionality
def checkMinusEquals: Unit = {
val hs = new WeakHashSet[String]()
val elements = List("hello", "goodbye")
elements foreach (hs += _)
hs -= "goodbye"
assert(hs.size == 1)
assert(hs contains "hello")
assert(!(hs contains "goodbye"))
hs.diagnostics.fullyValidate
}
// check -= when there are collisions
def checkMinusEqualsCollisions: Unit = {
val hs = new WeakHashSet[Collider]
val elements = List(Collider("hello"), Collider("goodbye"))
elements foreach (hs += _)
hs -= Collider("goodbye")
assert(hs.size == 1)
assert(hs contains Collider("hello"))
assert(!(hs contains Collider("goodbye")))
hs -= Collider("hello")
assert(hs.size == 0)
assert(!(hs contains Collider("hello")))
hs.diagnostics.fullyValidate
}
// check that the clear method actually cleans everything
def checkClear: Unit = {
val size = 200
val hs = new WeakHashSet[String]()
val elements = (0 until size).toList map ("a" + _)
elements foreach (hs += _)
hs.clear()
assert(hs.size == 0)
elements foreach {i => assert(!(hs contains i))}
hs.diagnostics.fullyValidate
}
// check that the iterator covers all the contents
def checkIterator: Unit = {
val hs = new WeakHashSet[String]()
val elements = (0 until 20).toList map ("a" + _)
elements foreach (hs += _)
assert(elements.iterator.toList.sorted == elements.sorted)
hs.diagnostics.fullyValidate
}
// check that the iterator covers all the contents even when there is a collision
def checkIteratorCollisions: Unit = {
val hs = new WeakHashSet[Collider]
val elements = (0 until 20).toList map {x => Collider("a" + x)}
elements foreach (hs += _)
assert(elements.iterator.toList.sorted == elements.sorted)
hs.diagnostics.fullyValidate
}
}
}
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