New stdlib generators

libraries/stdlib/test/collections/IteratorsJVMTest.kt

@@ -0,0 +1,44 @@
+package test.collections
+
+import org.junit.Test as test
+import kotlin.test.*
+import java.util.*
+
+class IteratorsJVMTest {
+
+    test fun testEnumeration() {
+        val v = Vector<Int>()
+        for(i in 1..5)
+            v.add(i)
+
+        var sum = 0
+        for(k in v.elements())
+            sum += k
+
+        assertEquals(15, sum)
+    }
+
+    test fun flatMapAndTakeExtractTheTransformedElements() {
+        fun intToBinaryDigits() = { (i: Int) ->
+            val binary = Integer.toBinaryString(i)!!
+            var index = 0
+            stream<Char> { if (index < binary.length()) binary.get(index++) else null }
+        }
+
+        val expected = arrayListOf(
+                      '0', // fibonacci(0) = 0
+                      '1', // fibonacci(1) = 1
+                      '1', // fibonacci(2) = 1
+                 '1', '0', // fibonacci(3) = 2
+                 '1', '1', // fibonacci(4) = 3
+            '1', '0', '1'  // fibonacci(5) = 5
+        )
+
+        assertEquals(expected, fibonacci().flatMap<Int, Char>(intToBinaryDigits()).take(10).toList())
+    }
+
+    test fun flatMapOnStream() {
+        val result = listOf(1, 2).stream().flatMap<Int, Int> { (0..it).stream() }
+        assertEquals(listOf(0, 1, 0, 1, 2), result.toList())
+    }
+}