api: introduce SealHandleScope

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 0ee53ba8abe69ff385d1f166772ac4cdd00d24d3..00a83e3babd5dd7275e3e181ed33c93bb3fa0483 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -21645,3 +21645,35 @@ TEST(NewStringRangeError) {
   }
   free(buffer);
 }
+
+
+TEST(SealHandleScope) {
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope handle_scope(isolate);
+  LocalContext env;
+
+  v8::SealHandleScope seal(isolate);
+
+  // Should fail
+  v8::Local<v8::Object> obj = v8::Object::New(isolate);
+
+  USE(ob);
+}
+
+
+TEST(SealHandleScopeNested) {
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope handle_scope(isolate);
+  LocalContext env;
+
+  v8::SealHandleScope seal(isolate);
+
+  {
+    v8::HandleScope handle_scope(isolate);
+
+    // Should work
+    v8::Local<v8::Object> obj = v8::Object::New(isolate);
+
+    USE(ob);
+  }
+}