public void TestCalculateFunctionValueAtXEqual2()
        {
            decimal[]     functionParameters = new decimal[] { 2.0m, 4.0m, 6.0m };
            decimal       x    = 2.0m;
            MetodaNewtona form = new MetodaNewtona();

            decimal result = form.CalculateFunctionValueAtX(functionParameters, x);

            Assert.AreEqual(22.0m, result);
        }