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+/*
+Copyright 2018 Google Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS-IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#ifndef RESONANCE_AUDIO_UTILS_TEST_UTIL_H_
+#define RESONANCE_AUDIO_UTILS_TEST_UTIL_H_
+
+#include <cstddef>
+#include <vector>
+
+#include "base/integral_types.h"
+#include "base/audio_buffer.h"
+
+namespace vraudio {
+
+// Silences an audio channel.
+void GenerateSilence(AudioBuffer::Channel* output);
+
+// Generates a sine wave at the specified frequency in hertz at the given
+// sampling rate in hertz.
+void GenerateSineWave(float frequency_hz, int sample_rate,
+                      AudioBuffer::Channel* output);
+
+// Generates a saw tooth signal between -1 and 1 for the given wave form length.
+void GenerateSawToothSignal(size_t tooth_length_samples,
+                            AudioBuffer::Channel* output);
+
+// Generates a Dirac impulse filter kernel, which delays filtered signals by
+// the given delay.
+void GenerateDiracImpulseFilter(size_t delay_samples,
+                                AudioBuffer::Channel* output);
+
+// Generates a linear ramp signal between -1 and 1.
+void GenerateIncreasingSignal(AudioBuffer::Channel* output);
+
+// Returns the index of the first non-zero element.
+size_t ZeroCompare(const AudioBuffer::Channel& signal, float epsilon);
+
+// Compares the content of two audio channels. Returns true if the absolute
+// difference between all samples is below epsion.
+bool CompareAudioBuffers(const AudioBuffer::Channel& buffer_a,
+                         const AudioBuffer::Channel& buffer_b, float epsilon);
+
+// Returns delayed_signal.size() in output if delayed_signal is approximately
+// equal to original_signal delayed by the given amount; otherwise, returns the
+// index of the first unequal element in delayed_signal.
+size_t DelayCompare(const AudioBuffer::Channel& original_signal,
+                    const AudioBuffer::Channel& delayed_signal, size_t delay,
+                    float epsilon);
+
+// Test if two signals are shifted by a fixed number of samples with zero
+// padding.
+bool TestZeroPaddedDelay(const AudioBuffer::Channel& original_signal,
+                         const AudioBuffer::Channel& delayed_signal,
+                         size_t delay_samples, float epsilon);
+
+// Returns absolute peak amplitude of a signal.
+double CalculateSignalPeak(const AudioBuffer::Channel& channel);
+
+// Returns energy of a signal.
+double CalculateSignalEnergy(const AudioBuffer::Channel& channel);
+
+// Returns Root Mean Square (RMS) of a signal.
+double CalculateSignalRms(const AudioBuffer::Channel& channel);
+
+// Expresses a magnitude measurement in dB.
+double DbFromMagnitude(double magnitude);
+
+// Expresses a power measurement in dB.
+double DbFromPower(double power);
+
+// Returns the maximum cross correlation value between two signals.
+// To be used only with signals of the same length.
+float MaxCrossCorrelation(const AudioBuffer::Channel& signal_a,
+                          const AudioBuffer::Channel& signal_b);
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_UTILS_TEST_UTIL_H_