public void IsCharSymbol()
        {
            //Arrange
            UnitTestMethods tester  = new UnitTestMethods();
            string          symbols = "$~^+<>|";

            foreach (char character in symbols)
            {
                //Act
                bool isSymbolActual = tester.IsCharSymbol(character);
                //Assert
                Assert.True(isSymbolActual);
            }
        }