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// Copyright 2018 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 "content/browser/net/network_quality_observer_impl.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "base/test/histogram_tester.h"
#include "base/time/time.h"
#include "net/nqe/effective_connection_type.h"
#include "net/nqe/network_quality_estimator_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
namespace {
TEST(NetworkQualityObserverImplTest, TestObserverNotified) {
base::MessageLoopForIO message_loop;
net::TestNetworkQualityEstimator estimator;
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(1));
NetworkQualityObserverImpl observer(&estimator);
// Give a chance for |observer| to register with the |estimator|.
base::RunLoop().RunUntilIdle();
base::HistogramTester histogram_tester;
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(500));
// RTT changed from 1 msec to 500 msec.
histogram_tester.ExpectBucketCount(
"NQE.ContentObserver.NetworkQualityMeaningfullyChanged", 1, 1);
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(625));
// RTT changed from 500 msec to 625 msec.
histogram_tester.ExpectBucketCount(
"NQE.ContentObserver.NetworkQualityMeaningfullyChanged", 1, 2);
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(626));
// RTT changed from 625 msec to 626 msec which is not a meaningful change.
histogram_tester.ExpectBucketCount(
"NQE.ContentObserver.NetworkQualityMeaningfullyChanged", 1, 2);
EXPECT_LE(1, histogram_tester.GetBucketCount(
"NQE.ContentObserver.NetworkQualityMeaningfullyChanged", 0));
}
} // namespace
} // namespace content
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