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/**
* Checks that various foreach methods overridden in mutable.HashMap as part of ticket #2526
* still work correctly.
*/
object Test {
import collection._
def main(args: Array[String]): Unit = {
val m = new mutable.HashMap[String, String]
/* Use non hash-based structure for verification */
val keys = List("a", "b", "c", "d", "e")
val valueSuffix = "value"
val values = keys.map(_ + valueSuffix)
val entries = keys.zip(values)
for (k <- keys) m(k) = k + valueSuffix
assertForeach(keys, m.keySet.iterator)
assertForeach(keys, m.keysIterator)
assertForeach(keys, m.keySet)
assertForeach(values, m.values.iterator)
assertForeach(values, m.valuesIterator)
assertForeach(entries, m)
}
/* Checks foreach of `actual` goes over all the elements in `expected` */
private def assertForeach[E](expected: Traversable[E], actual: Iterator[E]): Unit = {
val notYetFound = new mutable.ArrayBuffer[E]() ++= expected
actual.foreach { e =>
assert(notYetFound.contains(e))
notYetFound -= e
}
assert(notYetFound.size == 0, "mutable.HashMap.foreach should have iterated over: " + notYetFound)
}
/*
* Checks foreach of `actual` goes over all the elements in `expected`
* We duplicate the method above because there is no common inteface between Traversable and
* Iterator and we want to avoid converting between collections to ensure that we test what
* we mean to test.
*/
private def assertForeach[E](expected: Traversable[E], actual: Traversable[E]): Unit = {
val notYetFound = new mutable.ArrayBuffer[E]() ++= expected
actual.foreach { e =>
assert(notYetFound.contains(e))
notYetFound -= e
}
assert(notYetFound.size == 0, "mutable.HashMap.foreach should have iterated over: " + notYetFound)
}
}
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