Improvements to MemSizeTest Class

This pull request enhances the MemSizeTest class with the following key improvements:

• Expanded Test Coverage:

  • Added additional test cases to cover more edge conditions, including:
    • Large values approaching Long.MAX_VALUE.
    • Fractional units and their correct handling.
    • Negative values and zero.
    • Invalid inputs to verify proper exception handling.

• Enhanced Exception Testing:

  • Included more scenarios for invalid inputs to validate that the appropriate exceptions are thrown with clear messages.
  • Tested for exceptions due to:
    • Fractional bytes where not allowed.
    • Negative values in unit methods.
    • Input strings with invalid formats or characters.
    • Potential overflows exceeding Long.MAX_VALUE.