public void Clear_Accumulator(double a, double accumulatorValue)
        {
            var uut = new CalculatorUnit();

            uut.Clear();
            Assert.That(uut.Accumulator, Is.EqualTo(accumulatorValue));
        }
        public void Clear_Accumulator_Function2x(double a, double b, double accumulatorValue)
        {
            var uut = new CalculatorUnit();

            uut.Add(b, a);
            uut.Add(a, b);
            uut.Clear();
            Assert.That(uut.Accumulator, Is.EqualTo(accumulatorValue));
        }