Why does my Unit Test not display any cases in previous versions of LabVIEW?

Updated Jun 8, 2026

Issue Details

I added a Unit Test to the LabVIEW project and configured the related Test Cases, but when I opened it again, the correct configuration was not displayed. Why is this? Issue.png

Solution

Before LabVIEW 2024 Q1 (after 2020), if there are any Interface classes in the LabVIEW project, the Unit Test functionality will have problems. There are two solutions to this issue:

  1. (Recommended) Upgrade LabVIEW and the UTF tool to the latest version.
  2. If you need to ignore this error in an older version of LabVIEW, you can replace the attachment from this article to the specified location:
  • LabVIEW 2024: C:\Program Files\NI\LVAddons\utf32\1\vi.lib\utf\common\file\
  • LabVIEW 2020–2023 32-bit: C:\Program Files (x86)\National Instruments\LabVIEW xxxx\vi.lib\utf\common\file
  • LabVIEW 2020–2023 64-bit: C:\Program Files\National Instruments\LabVIEW xxxx\vi.lib\utf\common\file

Notes:

  • Remove the version name from the replacement file before replacing it.
  • You may need administrator privileges to replace this file.
  • The LabVIEW 2024 UTF does not distinguish between 32-bit and 64-bit versions.
  • The replacement attachment for each corresponding version does not distinguish by bit version.

Additional Information

This problem occurs because the UTF toolkit did not make corresponding changes to the interface class feature after LabVIEW added it (i.e. LabVIEW 2020). This problem will be solved in subsequent LabVIEW versions.

Attachments

utf_load_relative_lvclass.vi

Related Links

Bug 2702442: [Unit Test Framework] Unit Test Framework is not supporting the testing of LabVIEW interface feature. - Boards (azure.com)

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