public void Calculate_NotValidInput_Throw(string size)
        {
            // Arrange
            var fileSizeCalculator = new FileSizeCalculator();

            // Act
            fileSizeCalculator.Calculate(size);

            // Asserts
        }
        public void Calculate_ContainsSizeLetter_CalculatedSize(string size, long expectedSize)
        {
            // Arrange
            var fileSizeCalculator = new FileSizeCalculator();

            // Act
            long result = fileSizeCalculator.Calculate(size);

            // Assert
            Assert.AreEqual(expectedSize, result);
        }
        public void Calculate_ContainsNoSizeLetter_Throw()
        {
            // Arrange
            var    fileSizeCalculator = new FileSizeCalculator();
            string size = "50";

            // Act
            fileSizeCalculator.Calculate(size);

            // Assert
        }