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/*
* Copyright (c) 2016 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 "modules/audio_processing/echo_detector/mean_variance_estimator.h"
#include "test/gtest.h"
namespace webrtc {
TEST(MeanVarianceEstimatorTests, InsertTwoValues) {
MeanVarianceEstimator test_estimator;
// Insert two values.
test_estimator.Update(3.f);
test_estimator.Update(5.f);
EXPECT_GT(test_estimator.mean(), 0.f);
EXPECT_GT(test_estimator.std_deviation(), 0.f);
// Test Clear method
test_estimator.Clear();
EXPECT_EQ(test_estimator.mean(), 0.f);
EXPECT_EQ(test_estimator.std_deviation(), 0.f);
}
TEST(MeanVarianceEstimatorTests, InsertZeroes) {
MeanVarianceEstimator test_estimator;
// Insert the same value many times.
for (size_t i = 0; i < 20000; i++) {
test_estimator.Update(0.f);
}
EXPECT_EQ(test_estimator.mean(), 0.f);
EXPECT_EQ(test_estimator.std_deviation(), 0.f);
}
TEST(MeanVarianceEstimatorTests, ConstantValueTest) {
MeanVarianceEstimator test_estimator;
for (size_t i = 0; i < 20000; i++) {
test_estimator.Update(3.f);
}
// The mean should be close to three, and the standard deviation should be
// close to zero.
EXPECT_NEAR(3.0f, test_estimator.mean(), 0.01f);
EXPECT_NEAR(0.0f, test_estimator.std_deviation(), 0.01f);
}
TEST(MeanVarianceEstimatorTests, AlternatingValueTest) {
MeanVarianceEstimator test_estimator;
for (size_t i = 0; i < 20000; i++) {
test_estimator.Update(1.f);
test_estimator.Update(-1.f);
}
// The mean should be close to zero, and the standard deviation should be
// close to one.
EXPECT_NEAR(0.0f, test_estimator.mean(), 0.01f);
EXPECT_NEAR(1.0f, test_estimator.std_deviation(), 0.01f);
}
} // namespace webrtc
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