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// 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) {
scoped_refptr<SingleThreadTaskRunner> task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
{
SingleThreadTaskRunner::CurrentDefaultHandle sttcd1(task_runner);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner, SingleThreadTaskRunner::GetCurrentDefault());
}
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
}
// Verify that instantiating a `CurrentDefaultHandle` without `MayAlreadyExist`
// fails if there is already a current default `SingleThreadTaskRunner`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, DeathOnImplicitOverride) {
scoped_refptr<SingleThreadTaskRunner> task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> overidding_task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
SingleThreadTaskRunner::CurrentDefaultHandle sttcd(task_runner);
EXPECT_CHECK_DEATH({
SingleThreadTaskRunner::CurrentDefaultHandle overriding_sttcd(
overidding_task_runner);
});
}
// Verify nested instantiations of `CurrentHandleOverrideForTesting` in a scope
// with a `CurrentDefaultHandle`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, NestedOverrideForTesting) {
scoped_refptr<SingleThreadTaskRunner> task_runner_1(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_2(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_3(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_4(
MakeRefCounted<TestSimpleTaskRunner>());
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
{
// STTCD in place prior to override.
SingleThreadTaskRunner::CurrentDefaultHandle sttcd1(task_runner_1);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_1, SingleThreadTaskRunner::GetCurrentDefault());
{
// Override.
SingleThreadTaskRunner::CurrentHandleOverrideForTesting sttcd_override_2(
task_runner_2);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_2, SingleThreadTaskRunner::GetCurrentDefault());
{
// Nested override.
SingleThreadTaskRunner::CurrentHandleOverrideForTesting
sttcd_override_3(task_runner_3);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_3, SingleThreadTaskRunner::GetCurrentDefault());
}
// Back to single override.
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_2, SingleThreadTaskRunner::GetCurrentDefault());
{
// Backup to double override with another STTCD.
SingleThreadTaskRunner::CurrentHandleOverrideForTesting
sttcd_override_4(task_runner_4);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_4, SingleThreadTaskRunner::GetCurrentDefault());
}
}
// Back to simple STTCD.
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_1, SingleThreadTaskRunner::GetCurrentDefault());
}
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
}
// Same as above, but using `CurrentDefaultHandle` with `MayAlreadyExist`
// instead of `CurrentHandleOverrideForTesting`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest,
NestedOverrideWithMayAlreadyExist) {
scoped_refptr<SingleThreadTaskRunner> task_runner_1(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_2(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_3(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_4(
MakeRefCounted<TestSimpleTaskRunner>());
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
{
// STTCD in place prior to override.
SingleThreadTaskRunner::CurrentDefaultHandle sttcd1(task_runner_1);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_1, SingleThreadTaskRunner::GetCurrentDefault());
{
// Override.
SingleThreadTaskRunner::CurrentDefaultHandle sttcd_override_2(
task_runner_2,
SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_2, SingleThreadTaskRunner::GetCurrentDefault());
{
// Nested override.
SingleThreadTaskRunner::CurrentDefaultHandle sttcd_override_3(
task_runner_3,
SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_3, SingleThreadTaskRunner::GetCurrentDefault());
}
// Back to single override.
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_2, SingleThreadTaskRunner::GetCurrentDefault());
{
// Backup to double override with another STTCD.
SingleThreadTaskRunner::CurrentDefaultHandle sttcd_override_4(
task_runner_4,
SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_4, SingleThreadTaskRunner::GetCurrentDefault());
}
}
// Back to simple STTCD.
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_1, SingleThreadTaskRunner::GetCurrentDefault());
}
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
}
// 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) {
auto tr1 = MakeRefCounted<TestSimpleTaskRunner>();
SingleThreadTaskRunner::CurrentDefaultHandle handle(
tr1, SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_TRUE(SequencedTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SequencedTaskRunner::GetCurrentDefault());
{
SingleThreadTaskRunner::CurrentDefaultHandle nested_handle(
nullptr,
SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_CHECK_DEATH(
{ auto tr2 = SingleThreadTaskRunner::GetCurrentDefault(); });
EXPECT_FALSE(SequencedTaskRunner::HasCurrentDefault());
EXPECT_CHECK_DEATH(
{ auto tr2 = SequencedTaskRunner::GetCurrentDefault(); });
}
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_TRUE(SequencedTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SequencedTaskRunner::GetCurrentDefault());
}
// 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) {
auto tr1 = MakeRefCounted<TestSimpleTaskRunner>();
auto tr2 = MakeRefCounted<TestSimpleTaskRunner>();
SingleThreadTaskRunner::CurrentDefaultHandle handle(
tr1, SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_TRUE(SequencedTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SequencedTaskRunner::GetCurrentDefault());
{
SingleThreadTaskRunner::CurrentDefaultHandle nested_handle(
tr2, SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr2, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_TRUE(SequencedTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr2, SequencedTaskRunner::GetCurrentDefault());
}
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_TRUE(SequencedTaskRunner::HasCurrentDefault());
EXPECT_EQ(tr1, SequencedTaskRunner::GetCurrentDefault());
}
// Verify nested instantiations of `CurrentHandleOverrideForTesting` in a scope
// without a `CurrentDefaultHandle`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, OverrideNoExistingSTTCD) {
scoped_refptr<SingleThreadTaskRunner> task_runner_1(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> task_runner_2(
MakeRefCounted<TestSimpleTaskRunner>());
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
{
// Override with no STTCD in place.
SingleThreadTaskRunner::CurrentHandleOverrideForTesting sttcd_override_1(
task_runner_1);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_1, SingleThreadTaskRunner::GetCurrentDefault());
{
// Nested override works the same.
SingleThreadTaskRunner::CurrentHandleOverrideForTesting sttcd_override_2(
task_runner_2);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_2, SingleThreadTaskRunner::GetCurrentDefault());
}
// Back to single override.
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner_1, SingleThreadTaskRunner::GetCurrentDefault());
}
EXPECT_FALSE(SingleThreadTaskRunner::HasCurrentDefault());
}
// Verify that `CurrentDefaultHandle` can't be instantiated without
// `MayAlreadyExist` in the scope of a `CurrentHandleOverrideForTesting`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest, DeathOnSTTCDOverOverride) {
scoped_refptr<SingleThreadTaskRunner> task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
scoped_refptr<SingleThreadTaskRunner> overidding_task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
SingleThreadTaskRunner::CurrentHandleOverrideForTesting sttcd_override(
task_runner);
EXPECT_CHECK_DEATH({
SingleThreadTaskRunner::CurrentDefaultHandle overriding_sttrcd(
overidding_task_runner);
});
}
// Verify that running a `RunLoop` is supported in the scope of a
// `CurrentDefaultHandle` with `MayAlreadyExist`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest,
NestedRunLoopAllowedUnderHandleOverride) {
test::SingleThreadTaskEnvironment task_environment;
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
scoped_refptr<SingleThreadTaskRunner> task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
SingleThreadTaskRunner::CurrentDefaultHandle sttrcd_override(
task_runner,
SingleThreadTaskRunner::CurrentDefaultHandle::MayAlreadyExist{});
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_EQ(task_runner, SequencedTaskRunner::GetCurrentDefault());
RunLoop().RunUntilIdle();
}
// Verify that running a `RunLoop` fails in the scope of a
// `CurrentHandleOverrideForTesting`.
TEST(SingleThreadTaskRunnerCurrentDefaultHandleTest,
NestedRunLoopDisallowedUnderHandleOverrideForTesting) {
test::SingleThreadTaskEnvironment task_environment;
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
scoped_refptr<SingleThreadTaskRunner> task_runner(
MakeRefCounted<TestSimpleTaskRunner>());
SingleThreadTaskRunner::CurrentHandleOverrideForTesting sttcd_override(
task_runner);
EXPECT_TRUE(SingleThreadTaskRunner::HasCurrentDefault());
EXPECT_EQ(task_runner, SingleThreadTaskRunner::GetCurrentDefault());
EXPECT_EQ(task_runner, SequencedTaskRunner::GetCurrentDefault());
EXPECT_DCHECK_DEATH({ RunLoop().RunUntilIdle(); });
}
} // namespace base
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