Implement WeakMap.prototype.clear function.

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 d60c59c90712edc3a84b077280d11a8964d12f76..cf18745ae85a30d5f2748838777d156de2799143 100644
--- a/test/mjsunit/harmony/collections.js
+++ b/test/mjsunit/harmony/collections.js
@@ -377,17 +377,39 @@ for (var i = 9; i >= 0; i--) {
   assertEquals(i, m.size);
 }
 
-// Test clear
-var a = new Set();
-s.add(42);
-assertTrue(s.has(42));
-s.clear();
-assertFalse(s.has(42));
-assertEquals(0, s.size);
 
-var m = new Map();
-m.set(42, true);
-assertTrue(m.has(42));
-m.clear();
-assertFalse(m.has(42));
-assertEquals(0, m.size);
+// Test Set clear
+(function() {
+  var s = new Set();
+  s.add(42);
+  assertTrue(s.has(42));
+  assertEquals(1, s.size);
+  s.clear();
+  assertFalse(s.has(42));
+  assertEquals(0, s.size);
+})();
+
+
+// Test Map clear
+(function() {
+  var m = new Map();
+  m.set(42, true);
+  assertTrue(m.has(42));
+  assertEquals(1, m.size);
+  m.clear();
+  assertFalse(m.has(42));
+  assertEquals(0, m.size);
+})();
+
+
+// Test WeakMap clear
+(function() {
+  var k = new Object();
+  var w = new WeakMap();
+  w.set(k, 23);
+  assertTrue(w.has(k));
+  assertEquals(23, w.get(k));
+  w.clear();
+  assertFalse(w.has(k));
+  assertEquals(undefined, w.get(k));
+})();