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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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TESTING_TASK_ENVIRONMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TESTING_TASK_ENVIRONMENT_H_
#include <optional>
#include "base/test/task_environment.h"
#include "third_party/blink/renderer/platform/scheduler/common/task_priority.h"
#include "third_party/blink/renderer/platform/testing/main_thread_isolate.h"
#include "third_party/blink/renderer/platform/testing/scoped_main_thread_overrider.h"
#include "v8/include/v8-forward.h"
namespace blink::scheduler {
class MainThreadSchedulerImpl;
}
namespace blink::test {
// TaskEnvironment is a convenience class which allows usage of these
// APIs within its scope:
// - Same APIs as base::test::TaskEnvironment.
// - Blink Main Thread isolate.
// - blink::scheduler::WebThreadScheduler.
//
// Only tests that need blink APIs should instantiate a
// blink::test::TaskEnvironment. Use base::test::SingleThreadTaskEnvironment or
// base::test::TaskEnvironment otherwise.
//
// Tests that render <video> may also need CSSDefaultStyleSheets::TestingScope
// (see comments on that class).
class TaskEnvironment : public base::test::TaskEnvironment {
public:
using ValidTraits = base::test::TaskEnvironment::ValidTraits;
template <typename... Traits>
requires base::trait_helpers::AreValidTraits<ValidTraits, Traits...>
explicit TaskEnvironment(Traits... traits)
: TaskEnvironment(CreateTaskEnvironmentWithPriorities(
blink::scheduler::CreatePrioritySettings(),
SubclassCreatesDefaultTaskRunner{},
traits...)) {}
~TaskEnvironment() override;
scheduler::MainThreadSchedulerImpl* main_thread_scheduler() {
return scheduler_.get();
}
v8::Isolate* isolate() { return main_thread_isolate_->isolate(); }
void ResetIsolate() { main_thread_isolate_.reset(); }
static bool IsSupported();
private:
// When |real_main_thread_scheduler|, instantiate a full featured
// blink::MainThreadScheduler as opposed to a simple Thread scheduler.
explicit TaskEnvironment(
base::test::TaskEnvironment&& scoped_task_environment);
std::unique_ptr<scheduler::MainThreadSchedulerImpl> scheduler_;
std::optional<MainThreadIsolate> main_thread_isolate_;
std::optional<ScopedMainThreadOverrider> main_thread_overrider_;
};
} // namespace blink::test
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TESTING_TASK_ENVIRONMENT_H_
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