chromium/base/cancelable_callback_unittest.cc

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/cancelable_callback.h"

#include <memory>
#include <optional>

#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/task_environment.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {
namespace {

class TestRefCounted : public RefCountedThreadSafe<TestRefCounted> { … };

void Increment(int* count) { … }
void IncrementBy(int* count, int n) { … }
void RefCountedParam(const scoped_refptr<TestRefCounted>& ref_counted) { … }

void OnMoveOnlyReceived(int* value, std::unique_ptr<int> result) { … }

// Cancel().
//  - Callback can be run multiple times.
//  - After Cancel(), Run() completes but has no effect.
TEST(CancelableCallbackTest, Cancel) { … }

// Cancel() called multiple times.
//  - Cancel() cancels all copies of the wrapped callback.
//  - Calling Cancel() more than once has no effect.
//  - After Cancel(), callback() returns a null callback.
TEST(CancelableCallbackTest, MultipleCancel) { … }

// CancelableRepeatingCallback destroyed before callback is run.
//  - Destruction of CancelableRepeatingCallback cancels outstanding callbacks.
TEST(CancelableCallbackTest, CallbackCanceledOnDestruction) { … }

// Cancel() called on bound closure with a RefCounted parameter.
//  - Cancel drops wrapped callback (and, implicitly, its bound arguments).
TEST(CancelableCallbackTest, CancelDropsCallback) { … }

// Reset().
//  - Reset() replaces the existing wrapped callback with a new callback.
//  - Reset() deactivates outstanding callbacks.
TEST(CancelableCallbackTest, Reset) { … }

// IsCanceled().
//  - Cancel() transforms the CancelableOnceCallback into a cancelled state.
TEST(CancelableCallbackTest, IsNull) { … }

// CancelableRepeatingCallback posted to a task environment with PostTask.
//  - Posted callbacks can be cancelled.
//  - Chained callbacks from `.Then()` still run on cancelled callbacks.
TEST(CancelableCallbackTest, PostTask) { … }

// CancelableRepeatingCallback posted to a task environment with
// PostTaskAndReply.
//  - Posted callbacks can be cancelled.
TEST(CancelableCallbackTest, PostTaskAndReply) { … }

// CancelableRepeatingCallback can be used with move-only types.
TEST(CancelableCallbackTest, MoveOnlyType) { … }

}  // namespace
}  // namespace base