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// Copyright (C) 2016 Lukas Lalinsky
// Distributed under the MIT license, see the LICENSE file for details.
#include <gtest/gtest.h>
#include "utils/gradient.h"
using namespace chromaprint;
TEST(Gradient, Empty)
{
std::vector<float> input, output;
Gradient(input.begin(), input.end(), std::back_inserter(output));
ASSERT_EQ(0, output.size());
}
TEST(Gradient, OneElement)
{
std::vector<float> input, output;
input.push_back(1.0f);
Gradient(input.begin(), input.end(), std::back_inserter(output));
ASSERT_EQ(1, output.size());
ASSERT_FLOAT_EQ(0.0f, output[0]);
}
TEST(Gradient, TwoElements)
{
std::vector<float> input, output;
input.push_back(1.0f);
input.push_back(2.0f);
Gradient(input.begin(), input.end(), std::back_inserter(output));
ASSERT_EQ(2, output.size());
ASSERT_FLOAT_EQ(1.0f, output[0]);
ASSERT_FLOAT_EQ(1.0f, output[1]);
}
TEST(Gradient, ThreeElements)
{
std::vector<float> input, output;
input.push_back(1.0f);
input.push_back(2.0f);
input.push_back(4.0f);
Gradient(input.begin(), input.end(), std::back_inserter(output));
ASSERT_EQ(3, output.size());
ASSERT_FLOAT_EQ(1.0f, output[0]);
ASSERT_FLOAT_EQ(1.5f, output[1]);
ASSERT_FLOAT_EQ(2.0f, output[2]);
}
TEST(Gradient, FourElements)
{
std::vector<float> input, output;
input.push_back(1.0f);
input.push_back(2.0f);
input.push_back(4.0f);
input.push_back(10.0f);
Gradient(input.begin(), input.end(), std::back_inserter(output));
ASSERT_EQ(4, output.size());
ASSERT_FLOAT_EQ(1.0f, output[0]);
ASSERT_FLOAT_EQ(1.5f, output[1]);
ASSERT_FLOAT_EQ(4.0f, output[2]);
ASSERT_FLOAT_EQ(6.0f, output[3]);
}
TEST(Gradient, OverrideInput)
{
std::vector<float> input;
input.push_back(1.0f);
input.push_back(2.0f);
input.push_back(4.0f);
input.push_back(10.0f);
Gradient(input.begin(), input.end(), input.begin());
ASSERT_EQ(4, input.size());
ASSERT_FLOAT_EQ(1.0f, input[0]);
ASSERT_FLOAT_EQ(1.5f, input[1]);
ASSERT_FLOAT_EQ(4.0f, input[2]);
ASSERT_FLOAT_EQ(6.0f, input[3]);
}
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