public void Multiply_MultiplyTwoNumbers_ShouldReturnProductOfTwoNumbers()
        {
            //Arrange
            MainCalculator calculate = new MainCalculator();

            //Act
            int result = calculate.Multiply(5, 4);

            //Assert
            Assert.AreEqual(20, result); //(expected value, "Act" object/variable)
        }
        public void Multiply_MultiplyTwoNumbers_ShouldReturnProductOfTwoNumbers()
        {
            //Arrange
            //MainCalculator calculate = new MainCalculator(); Lines 14 & 19 takes the place of this line

            //Act
            int result = calculate.Multiply(5, 4);

            //Assert
            Assert.That(result, Is.EqualTo(20)); //(expected value, "Act" object/variable)
        }