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#include <gtest/gtest.h>
#include <cmath>
#include "../../../src/utils/RandomGenerator.h"
class RandomGeneratorTest: public testing::Test
{
protected:
void generateRandoms();
void checkStats();
private:
void checkMinMeanMax(double min, double mean, double max);
void minMeanMax(double& min, double& mean, double& max);
double stddev(double mean);
protected:
static const int Num = 10000;
protected:
RandomGenerator random;
double x[Num];
};
TEST_F(RandomGeneratorTest, Stats)
{
generateRandoms();
checkStats();
}
TEST_F(RandomGeneratorTest, getArray)
{
QByteArray ba = random.getArray();
}
void RandomGeneratorTest::generateRandoms()
{
for(int i = 0; i < Num; i++)
x[i] = random.getInRange_11();
}
void RandomGeneratorTest::checkStats()
{
double min;
double mean;
double max;
minMeanMax(min, mean, max);
checkMinMeanMax(min, mean, max);
ASSERT_GT(stddev(mean), 0.55);
}
void RandomGeneratorTest::checkMinMeanMax(double min, double mean, double max)
{
ASSERT_NEAR(-1, min, 0.01);
ASSERT_NEAR(0, mean, 0.2);
ASSERT_NEAR(1, max, 0.01);
}
void RandomGeneratorTest::minMeanMax(double& min, double& mean, double& max)
{
double sum = 0;
min = 1000;
max = -1000;
for(int i = 0; i < Num; i++)
{
min = fmin(x[i], min);
max = fmax(x[i], max);
sum += x[i];
}
mean = sum / Num;
}
double RandomGeneratorTest::stddev(double mean)
{
double varSum = 0;
for(int i = 0; i < Num; i++)
varSum += pow((mean - x[i]), 2);
return sqrt(varSum / Num);
}
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