added a couple of helper methods to Map to be able look up in a Map with function to provide a default value

testlib/test/MapTest.kt

@@ -0,0 +1,35 @@
+namespace test.collections
+
+import std.test.*
+
+// TODO can we avoid importing all this stuff by default I wonder?
+// e.g. making println and the collection builder methods public by default?
+import std.*
+import std.io.*
+import std.util.*
+import java.util.*
+
+class MapTest() : TestSupport() {
+  val data = HashMap<String, Int>()
+
+  fun testGetOrElse() {
+    val a = data.getOrElse("foo"){2}
+    assertEquals(2, a)
+
+    val b = data.getOrElse("foo"){3}
+    assertEquals(3, b)
+
+    // TODO should be able to miss the () off of size
+    assertEquals(0, data.size())
+  }
+
+  fun testGetOrElseUpdate() {
+    val a = data.getOrElseUpdate("foo"){2}
+    assertEquals(2, a)
+
+    val b = data.getOrElseUpdate("foo"){3}
+    assertEquals(2, b)
+
+    assertEquals(1, data.size())
+  }
+}