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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/test/task_environment.h"
// WebTaskEnvironment is the iOS equivalent of content::BrowserTaskEnvironment.
// It's is a convenience class for creating a set of TestWebThreads and a thread
// pool in unit tests. For most tests, it is sufficient to just instantiate the
// WebTaskEnvironment as a member variable. It is a good idea to put the
// WebTaskEnvironment as the first member variable in test classes, so it is
// destroyed last, and the test threads always exist from the perspective of
// other classes.
// By default, all of the created TestWebThreads will be backed by a single
// shared MessageLoop. If a test truly needs separate threads, it can do so by
// passing the appropriate combination of option values during the
// WebTaskEnvironment construction.
// To synchronously run tasks posted to TestWebThreads that use the shared
// MessageLoop, call RunLoop::Run/RunUntilIdle() on the thread where the
// WebTaskEnvironment lives. The destructor of WebTaskEnvironment runs remaining
// TestWebThreads tasks and remaining BLOCK_SHUTDOWN thread pool tasks.
// Some tests using the IO thread expect a MessageLoopForIO. Passing IO_MAINLOOP
// will use a MessageLoopForIO for the main MessageLoop. Most of the time, this
// avoids needing to use a REAL_IO_THREAD.
#include <memory>
#include "base/macros.h"
namespace base {
class MessageLoop;
} // namespace base
namespace web {
class TestWebThread;
class WebTaskEnvironment : public base::test::TaskEnvironment {
// Used to specify the type of MessageLoop that backs the UI thread, and
// which of the named WebThreads should be backed by a real
// threads. The UI thread is always the main thread in a unit test.
enum Options {
IO_MAINLOOP = 1 << 0,
REAL_IO_THREAD = 1 << 1,
explicit WebTaskEnvironment(
int options = Options::DEFAULT,
base::test::TaskEnvironment::TimeSource time_source =
~WebTaskEnvironment() override;
void Init(int options);
std::unique_ptr<TestWebThread> ui_thread_;
std::unique_ptr<TestWebThread> io_thread_;
} // namespace web