public void If_CreateCalculationText_text_is_correct()
        {
            string zahl1     = "56";
            string @operator = "+";
            string zahl2     = "66";
            string Text      = ft.CreateCalculationText(zahl1, zahl2, @operator);
            string expected  = "56 + 66";

            Assert.AreEqual(expected, Text);
        }