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/*
* Copyright 2022 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "api/field_trials.h"
#include <memory>
#include "api/transport/field_trial_based_config.h"
#include "rtc_base/containers/flat_set.h"
#include "system_wrappers/include/field_trial.h"
#include "test/field_trial.h"
#include "test/gmock.h"
#include "test/gtest.h"
#if GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
#include "test/testsupport/rtc_expect_death.h"
#endif // GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
namespace webrtc {
namespace {
using ::testing::NotNull;
using ::webrtc::field_trial::FieldTrialsAllowedInScopeForTesting;
using ::webrtc::test::ScopedFieldTrials;
TEST(FieldTrialsTest, EmptyStringHasNoEffect) {
FieldTrialsAllowedInScopeForTesting k({"MyCoolTrial"});
FieldTrials f("");
f.RegisterKeysForTesting({"MyCoolTrial"});
EXPECT_FALSE(f.IsEnabled("MyCoolTrial"));
EXPECT_FALSE(f.IsDisabled("MyCoolTrial"));
}
TEST(FieldTrialsTest, EnabledDisabledMustBeFirstInValue) {
FieldTrials f(
"MyCoolTrial/EnabledFoo/"
"MyUncoolTrial/DisabledBar/"
"AnotherTrial/BazEnabled/");
f.RegisterKeysForTesting({"MyCoolTrial", "MyUncoolTrial", "AnotherTrial"});
EXPECT_TRUE(f.IsEnabled("MyCoolTrial"));
EXPECT_TRUE(f.IsDisabled("MyUncoolTrial"));
EXPECT_FALSE(f.IsEnabled("AnotherTrial"));
}
TEST(FieldTrialsTest, FieldTrialsDoesNotReadGlobalString) {
FieldTrialsAllowedInScopeForTesting k({"MyCoolTrial", "MyUncoolTrial"});
ScopedFieldTrials g("MyCoolTrial/Enabled/MyUncoolTrial/Disabled/");
FieldTrials f("");
f.RegisterKeysForTesting({"MyCoolTrial", "MyUncoolTrial"});
EXPECT_FALSE(f.IsEnabled("MyCoolTrial"));
EXPECT_FALSE(f.IsDisabled("MyUncoolTrial"));
}
TEST(FieldTrialsTest, FieldTrialsWritesGlobalString) {
FieldTrialsAllowedInScopeForTesting k({"MyCoolTrial", "MyUncoolTrial"});
FieldTrials f("MyCoolTrial/Enabled/MyUncoolTrial/Disabled/");
EXPECT_TRUE(webrtc::field_trial::IsEnabled("MyCoolTrial"));
EXPECT_TRUE(webrtc::field_trial::IsDisabled("MyUncoolTrial"));
}
TEST(FieldTrialsTest, FieldTrialsRestoresGlobalStringAfterDestruction) {
static constexpr char s[] = "SomeString/Enabled/";
ScopedFieldTrials g(s);
{
FieldTrials f("SomeOtherString/Enabled/");
EXPECT_STREQ(webrtc::field_trial::GetFieldTrialString(),
"SomeOtherString/Enabled/");
}
EXPECT_STREQ(webrtc::field_trial::GetFieldTrialString(), s);
}
#if GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
TEST(FieldTrialsTest, FieldTrialsDoesNotSupportSimultaneousInstances) {
FieldTrials f("SomeString/Enabled/");
RTC_EXPECT_DEATH(FieldTrials("SomeOtherString/Enabled/").Lookup("Whatever"),
"Only one instance");
}
#endif // GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
TEST(FieldTrialsTest, FieldTrialsSupportsSeparateInstances) {
{ FieldTrials f("SomeString/Enabled/"); }
{ FieldTrials f("SomeOtherString/Enabled/"); }
}
TEST(FieldTrialsTest, NonGlobalFieldTrialsInstanceDoesNotModifyGlobalString) {
FieldTrialsAllowedInScopeForTesting k({"SomeString"});
std::unique_ptr<FieldTrials> f =
FieldTrials::CreateNoGlobal("SomeString/Enabled/");
ASSERT_THAT(f, NotNull());
f->RegisterKeysForTesting({"SomeString"});
EXPECT_TRUE(f->IsEnabled("SomeString"));
EXPECT_FALSE(webrtc::field_trial::IsEnabled("SomeString"));
}
TEST(FieldTrialsTest, NonGlobalFieldTrialsSupportSimultaneousInstances) {
std::unique_ptr<FieldTrials> f1 =
FieldTrials::CreateNoGlobal("SomeString/Enabled/");
std::unique_ptr<FieldTrials> f2 =
FieldTrials::CreateNoGlobal("SomeOtherString/Enabled/");
ASSERT_THAT(f1, NotNull());
ASSERT_THAT(f2, NotNull());
f1->RegisterKeysForTesting({"SomeString", "SomeOtherString"});
f2->RegisterKeysForTesting({"SomeString", "SomeOtherString"});
EXPECT_TRUE(f1->IsEnabled("SomeString"));
EXPECT_FALSE(f1->IsEnabled("SomeOtherString"));
EXPECT_FALSE(f2->IsEnabled("SomeString"));
EXPECT_TRUE(f2->IsEnabled("SomeOtherString"));
}
TEST(FieldTrialsTest, GlobalAndNonGlobalFieldTrialsAreDisjoint) {
FieldTrialsAllowedInScopeForTesting k({"SomeString", "SomeOtherString"});
FieldTrials f1("SomeString/Enabled/");
std::unique_ptr<FieldTrials> f2 =
FieldTrials::CreateNoGlobal("SomeOtherString/Enabled/");
ASSERT_THAT(f2, NotNull());
f1.RegisterKeysForTesting({"SomeString", "SomeOtherString"});
f2->RegisterKeysForTesting({"SomeString", "SomeOtherString"});
EXPECT_TRUE(f1.IsEnabled("SomeString"));
EXPECT_FALSE(f1.IsEnabled("SomeOtherString"));
EXPECT_FALSE(f2->IsEnabled("SomeString"));
EXPECT_TRUE(f2->IsEnabled("SomeOtherString"));
}
TEST(FieldTrialsTest, FieldTrialBasedConfigReadsGlobalString) {
FieldTrialsAllowedInScopeForTesting k({"MyCoolTrial", "MyUncoolTrial"});
ScopedFieldTrials g("MyCoolTrial/Enabled/MyUncoolTrial/Disabled/");
FieldTrialBasedConfig f;
f.RegisterKeysForTesting({"MyCoolTrial", "MyUncoolTrial"});
EXPECT_TRUE(f.IsEnabled("MyCoolTrial"));
EXPECT_TRUE(f.IsDisabled("MyUncoolTrial"));
}
} // namespace
} // namespace webrtc