added extension methods MutableCollection#addAll(Iterable) and MutableCollection#addAll(Iterator) (#KT-4202 fixed)

libraries/stdlib/test/MutableCollectionsTest.kt

@@ -0,0 +1,29 @@
+package test.collections
+
+import kotlin.test.*
+
+import java.util.*
+
+import org.junit.Test as test
+
+class MutableCollectionTest {
+
+    test fun fromIterable() {
+        val data: Iterable<String> = arrayListOf("foo", "bar")
+
+        val collection = ArrayList<String>()
+        collection.addAll(data)
+
+        assertEquals(data, collection)
+    }
+
+    test fun fromIterator() {
+        val list = arrayListOf("foo", "bar")
+        val collection = ArrayList<String>()
+
+        collection.addAll(list.iterator())
+
+        assertEquals(list, collection)
+    }
+
+}