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/*
* Copyright (c) 2025 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 "test/create_test_field_trials.h"
#include <string>
#include "absl/flags/declare.h"
#include "absl/flags/flag.h"
#include "absl/strings/string_view.h"
#include "api/field_trials.h"
#include "test/gtest.h"
// Declare but do not explicitly include the definition of this flag as
// `CreateTestFieldTrials` has to depend on the definition of this flag.
ABSL_DECLARE_FLAG(std::string, force_fieldtrials);
namespace webrtc {
namespace {
// Flags are globals. To prevent altering behavior of other tests in the same
// binary when --force_fieldtrials flag is used, ensure flag is reset to the
// previous value after unit tests here runs.
class ScopedSetFlag {
public:
explicit ScopedSetFlag(absl::string_view value) {
old_value_ = absl::GetFlag(FLAGS_force_fieldtrials);
absl::SetFlag(&FLAGS_force_fieldtrials, value);
}
~ScopedSetFlag() { absl::SetFlag(&FLAGS_force_fieldtrials, old_value_); }
private:
std::string old_value_;
};
TEST(CreateTestFieldTrialsTest, UsesCommandLineFlag) {
ScopedSetFlag override_flag("Trial1/Value1/Trial2/Value2/");
FieldTrials field_trials = CreateTestFieldTrials();
field_trials.RegisterKeysForTesting({"Trial1", "Trial2"});
EXPECT_EQ(field_trials.Lookup("Trial1"), "Value1");
EXPECT_EQ(field_trials.Lookup("Trial2"), "Value2");
}
TEST(CreateTestFieldTrialsTest, UsesConstructionParameter) {
FieldTrials field_trials =
CreateTestFieldTrials("Trial1/Value1/Trial2/Value2/");
field_trials.RegisterKeysForTesting({"Trial1", "Trial2"});
EXPECT_EQ(field_trials.Lookup("Trial1"), "Value1");
EXPECT_EQ(field_trials.Lookup("Trial2"), "Value2");
}
TEST(CreateTestFieldTrialsTest,
ConstructionParameterTakesPrecedenceOverCommandLine) {
ScopedSetFlag override_flag("TrialCommon/ValueF/TrialFlag/FlagValue/");
FieldTrials field_trials = CreateTestFieldTrials(
"TrialCommon/ValueC/TrialConstructor/ConstructorValue/");
field_trials.RegisterKeysForTesting(
{"TrialCommon", "TrialFlag", "TrialConstructor"});
EXPECT_EQ(field_trials.Lookup("TrialCommon"), "ValueC");
EXPECT_EQ(field_trials.Lookup("TrialFlag"), "FlagValue");
EXPECT_EQ(field_trials.Lookup("TrialConstructor"), "ConstructorValue");
}
} // namespace
} // namespace webrtc
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