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import collection.immutable.ListMap
object Test {
def testImmutableMinus() {
val empty = ListMap.empty[Int, Int]
val m0 = ListMap(1 -> 1, 2 -> 2)
val m1 = m0 - 3
assert (m1 eq m0)
val m2 = m0 - 1
assert (m2.size == 1)
val m3 = m2 - 2
assert (m3 eq empty)
val m4 = ListMap(1 -> 1, 2 -> 2, 3 -> 3)
val m5 = m4 - 1
assert (m5 == ListMap(2 -> 2, 3 -> 3))
assert (m5.toList == (2, 2)::(3, 3)::Nil)
assert ((empty - 1) eq empty)
}
def main(args: Array[String]) {
testImmutableMinus()
}
}
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