chromium/base/task/single_thread_task_runner_unittest.cc

// Copyright 2017 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/task/single_thread_task_runner.h"

#include "base/memory/scoped_refptr.h"
#include "base/run_loop.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/gtest_util.h"
#include "base/test/task_environment.h"
#include "base/test/test_simple_task_runner.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {

TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, Basic) { … }

// Verify that instantiating a `CurrentDefaultHandle` without `MayAlreadyExist`
// fails if there is already a current default `SingleThreadTaskRunner`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, DeathOnImplicitOverride) { … }

// Verify nested instantiations of `CurrentHandleOverrideForTesting` in a scope
// with a `CurrentDefaultHandle`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, NestedOverrideForTesting) { … }

// Same as above, but using `CurrentDefaultHandle` with `MayAlreadyExist`
// instead of `CurrentHandleOverrideForTesting`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest,
     NestedOverrideWithMayAlreadyExist) { … }

// Verify that `CurrentDefaultHandle` can be used to set the current default
// `SingleThreadTaskRunner` and `SequencedTaskRunner` to null in a scope that
// already has a default.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, OverrideWithNull) { … }

// Verify that `CurrentDefaultHandle` can be used to set the current default
// `SingleThreadTaskRunner` and `SequencedTaskRunner` to a non-null value in a
// scope that already has a default.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, OverrideWithNonNull) { … }

// Verify nested instantiations of `CurrentHandleOverrideForTesting` in a scope
// without a `CurrentDefaultHandle`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, OverrideNoExistingSTTCD) { … }

// Verify that `CurrentDefaultHandle` can't be instantiated without
// `MayAlreadyExist` in the scope of a `CurrentHandleOverrideForTesting`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, DeathOnSTTCDOverOverride) { … }

// Verify that running a `RunLoop` is supported in the scope of a
// `CurrentDefaultHandle` with `MayAlreadyExist`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest,
     NestedRunLoopAllowedUnderHandleOverride) { … }

// Verify that running a `RunLoop` fails in the scope of a
// `CurrentHandleOverrideForTesting`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest,
     NestedRunLoopDisallowedUnderHandleOverrideForTesting) { … }

}  // namespace base