ES6 Map/Set iterators/forEach improvements

test/mjsunit/harmony/collections.js

Index: test/mjsunit/harmony/collections.js
diff --git a/test/mjsunit/harmony/collections.js b/test/mjsunit/harmony/collections.js
index 7bf7bf70639aaee83230ed9beefbcc15ad310eb5..22a76399087225f729c7e415974529d426587743 100644
--- a/test/mjsunit/harmony/collections.js
+++ b/test/mjsunit/harmony/collections.js
@@ -852,3 +852,50 @@ for (var i = 9; i >= 0; i--) {
   });
   assertEquals(4950, accumulated);
 })();
+
+
+(function TestMapForEachAllRemovedTransition() {
+  var map = new Map;
+  map.set(0, 0);
+
+  var buffer = [];
+  map.forEach(function(v) {
+    buffer.push(v);
+    if (v === 0) {
+      for (var i = 1; i < 4; i++) {
+        map.set(i, i);
+      }
+    }
+
+    if (v === 3) {
+      for (var i = 0; i < 4; i++) {
+        map.delete(i);
+      }
+      for (var i = 4; i < 8; i++) {
+        map.set(i, i);
+      }
+    }
+  });
+
+  assertArrayEquals([0, 1, 2, 3, 4, 5, 6, 7], buffer);
+})();
+
+
+(function TestMapForEachClearTransition() {
+  var map = new Map;
+  map.set(0, 0);
+
+  var i = 0;
+  var buffer = [];
+  map.forEach(function(v) {
+    buffer.push(v);
+    if (++i < 5) {
+      for (var j = 0; j < 5; j++) {
+        map.clear();
+        map.set(i, i);
+      }
+    }
+  });
+
+  assertArrayEquals([0, 1, 2, 3, 4], buffer);
+})();