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diff --git a/dom/bindings/test/TestInterfaceAsyncIterableSingle.h b/dom/bindings/test/TestInterfaceAsyncIterableSingle.h
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+++ b/dom/bindings/test/TestInterfaceAsyncIterableSingle.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_TestInterfaceAsyncIterableSingle_h
+#define mozilla_dom_TestInterfaceAsyncIterableSingle_h
+
+#include "IterableIterator.h"
+#include "nsCOMPtr.h"
+#include "nsWrapperCache.h"
+#include "nsTArray.h"
+#include "mozilla/dom/TestInterfaceJSMaplikeSetlikeIterableBinding.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class GlobalObject;
+struct TestInterfaceAsyncIterableSingleOptions;
+
+// Implementation of test binding for webidl iterable interfaces, using
+// primitives for value type
+class TestInterfaceAsyncIterableSingle : public nsISupports,
+                                         public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TestInterfaceAsyncIterableSingle)
+
+  explicit TestInterfaceAsyncIterableSingle(nsPIDOMWindowInner* aParent,
+                                            bool aFailToInit = false);
+  nsPIDOMWindowInner* GetParentObject() const;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+  static already_AddRefed<TestInterfaceAsyncIterableSingle> Constructor(
+      const GlobalObject& aGlobal,
+      const TestInterfaceAsyncIterableSingleOptions& aOptions, ErrorResult& rv);
+
+  using Iterator = AsyncIterableIterator<TestInterfaceAsyncIterableSingle>;
+  already_AddRefed<Promise> GetNextIterationResult(Iterator* aIterator,
+                                                   ErrorResult& aRv);
+
+  struct IteratorData {
+    void Traverse(nsCycleCollectionTraversalCallback& cb);
+    void Unlink();
+
+    uint32_t mIndex = 0;
+    uint32_t mMultiplier = 1;
+    Sequence<OwningNonNull<Promise>> mBlockingPromises;
+    size_t mBlockingPromisesIndex = 0;
+    uint32_t mFailNextAfter = 4294967295;
+    bool mThrowFromNext = false;
+    RefPtr<TestThrowingCallback> mThrowFromReturn;
+  };
+
+  void InitAsyncIteratorData(IteratorData& aData, Iterator::IteratorType aType,
+                             ErrorResult& aError);
+
+ protected:
+  already_AddRefed<Promise> GetNextIterationResult(
+      IterableIteratorBase* aIterator, IteratorData& aData, ErrorResult& aRv);
+
+  virtual ~TestInterfaceAsyncIterableSingle() = default;
+
+ private:
+  void ResolvePromise(IterableIteratorBase* aIterator, IteratorData& aData,
+                      Promise* aPromise);
+
+  nsCOMPtr<nsPIDOMWindowInner> mParent;
+  bool mFailToInit;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_TestInterfaceAsyncIterableSingle_h