1 files changed, 79 insertions, 0 deletions
diff --git a/tests/unit/RandomGenerator/RandomGenerator_test.cpp b/tests/unit/RandomGenerator/RandomGenerator_test.cpp
new file mode 100644
index 0000000..d334c9b
--- /dev/null
+++ b/tests/unit/RandomGenerator/RandomGenerator_test.cpp
@@ -0,0 +1,79 @@
+#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);
+}