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// Copyright 2023 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/test/run_until.h"
#include <functional>
#include "base/callback_list.h"
#include "base/functional/callback.h"
#include "base/task/current_thread.h"
#include "base/test/scoped_run_loop_timeout.h"
#include "base/test/test_future.h"
#include "base/time/time_override.h"
namespace base::test {
void TestPredicateOrRegisterOnNextIdleCallback(
base::FunctionRef<bool(void)> condition,
CallbackListSubscription* on_idle_callback_subscription,
OnceClosure ready_callback) {
if (condition()) {
// Invoke `ready_callback` if `condition` evaluates to true.
std::move(ready_callback).Run();
} else {
// Otherwise try again the next time the thread is idle.
*on_idle_callback_subscription =
CurrentThread::Get().RegisterOnNextIdleCallback(
{},
BindOnce(TestPredicateOrRegisterOnNextIdleCallback, condition,
on_idle_callback_subscription, std::move(ready_callback)));
}
}
bool RunUntil(base::FunctionRef<bool(void)> condition) {
// We expect a RunLoop timeout except under MOCK_TIME where TaskEnvironment
// disables TaskEnvironment::mock_time_domain_ after fast-forwarding into the
// timeout.
CHECK(test::ScopedRunLoopTimeout::ExistsForCurrentThread() ||
subtle::ScopedTimeClockOverrides::overrides_active())
<< "No RunLoop timeout set, meaning `RunUntil` will hang forever on "
"failure.";
test::TestFuture<void> ready_signal;
CallbackListSubscription on_idle_callback_subscription;
on_idle_callback_subscription =
CurrentThread::Get().RegisterOnNextIdleCallback(
{},
BindOnce(TestPredicateOrRegisterOnNextIdleCallback, condition,
&on_idle_callback_subscription, ready_signal.GetCallback()));
return ready_signal.Wait();
}
} // namespace base::test
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