Error using Git source control with Simulink

I'm using MATLAB 2023a and Git for a Simulink Project (.prj). The project contains a "main" Simulink model that references several other models using Model Reference blocks. Most of these models also have test harnesses.

When I try to compare my model against its ancestor (or any Git revision), I get the following error pop-up:

Cannot open test harness 'name-of-test' as another model with the same name is currently open. Please close the other model before opening this harness

Additionaly, when comparing the "main" model, the comparison results show only changes in test harnesses but no differences in the actual model itself.

Important notes:

• I am not editing the test harness
• I don't have any harness open during the comparison
• This issue affects only models with test harnesses

Has anyone run into this behaviour? Is there a way to configure MATLAB/Simulink (or Git) to ignore test harness models during comparison so that only actual model changes are shown?

Answer 1

[Edoardo]

I managed to solve this issue and wanted to share the solution in case it helps others.

This issue was caused by the test harnesses being internal to the Simulink models. Exporting the test harnesses into separate Simulink files resolved the problem.