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Diffstat (limited to 'third_party/libwebrtc/modules/audio_processing/echo_detector/mean_variance_estimator_unittest.cc')
-rw-r--r-- | third_party/libwebrtc/modules/audio_processing/echo_detector/mean_variance_estimator_unittest.cc | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/echo_detector/mean_variance_estimator_unittest.cc b/third_party/libwebrtc/modules/audio_processing/echo_detector/mean_variance_estimator_unittest.cc new file mode 100644 index 0000000000..8327d23e8a --- /dev/null +++ b/third_party/libwebrtc/modules/audio_processing/echo_detector/mean_variance_estimator_unittest.cc @@ -0,0 +1,65 @@ + +/* + * 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 |