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diff --git a/pw_sync/public/pw_sync/lock_testing.h b/pw_sync/public/pw_sync/lock_testing.h
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+// Copyright 2023 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+#pragma once
+
+/// This file provides types that meet C++'s lock-related named requirements,
+/// but do no actual locking. They are only intended for use in tests.
+
+#include <chrono>
+#include <ratio>
+
+#include "pw_sync/virtual_basic_lockable.h"
+
+namespace pw::sync::test {
+
+/// Fake lock that meet's C++'s \em BasicLockable named requirement.
+class FakeBasicLockable : public VirtualBasicLockable {
+ public:
+  virtual ~FakeBasicLockable() = default;
+
+  bool locked() const { return locked_; }
+
+ protected:
+  bool locked_ = false;
+
+ private:
+  void DoLockOperation(Operation operation) override;
+};
+
+/// Fake lock that meet's C++'s \em Lockable named requirement.
+class FakeLockable : public FakeBasicLockable {
+ public:
+  bool try_lock();
+};
+
+/// Fake clock that merely provides the expected dependent types.
+struct FakeClock {
+  using rep = int64_t;
+  using period = std::micro;
+  using duration = std::chrono::duration<rep, period>;
+  using time_point = std::chrono::time_point<FakeClock>;
+};
+
+/// Fake clock that provides invalid dependent types.
+///
+/// This clock is guaranteed to fail `is_lockable_until<Lock, NoClock>` for any
+/// `Lock`.
+struct NotAClock {
+  using rep = void;
+  using period = void;
+  using duration = void;
+  using time_point = void;
+};
+
+/// Fake lock that meet's C++'s \em TimedLockable named requirement.
+class FakeTimedLockable : public FakeLockable {
+ public:
+  bool try_lock_for(const FakeClock::duration&) { return try_lock(); }
+  bool try_lock_until(const FakeClock::time_point&) { return try_lock(); }
+};
+
+}  // namespace pw::sync::test