public void Test_AverageByMean()
        {
            IAvaragingMethod method = new MeanAvaragingMethod();

            double expected = 8.3636363;

            double actual = method.CalculateAvarage(values);

            Assert.AreEqual(expected, actual, 0.000001);
        }
        public void Test_AverageByMean_Exception()
        {
            IAvaragingMethod method = new MeanAvaragingMethod();

            Assert.Throws <ArgumentNullException>(() => method.CalculateAvarage(null));
        }