public void If_CreateEquationText_text_is_correct()
        {
            string zahl1     = "5";
            string @operator = "*";
            string zahl2     = "5";
            int    ergebnis  = 25;
            string Text      = ft.CreateEquationText(zahl1, zahl2, @operator, ergebnis);
            string expected  = "5 * 5  = 25";

            Assert.AreEqual(expected, Text);
        }