Why does my test display "--" instead of an execution percentage in Simulink Test Manager?

I have created a Simulink Model with two subsystems. I am trying to test each subsystem using individual test harnesses for each subsystem. However, when I run the tests in Simulink Test Manager, one test displays an execution percentage of 100%, and the other test displays "--" as seen in the image below:

I have verified that both subsystems successfully run. I anticipated coverage for both subsystems, as each one has a corresponding test harness that is executed within the Simulink Test Manager. What could be the cause of this discrepancy?

Answer 1

[MathWorks Support Team]

When the aggregated coverage results in Simulink Test Manager displays "--" as a subsystem's execution, it means that there is no block that receives coverage. Blocks that receive coverage must be non-virtual blocks. The subsystem that did not receive any coverage and showed "--" in the Simulink Test Manager may contain solely virtual blocks, thus the subsystem did not receive coverage. You can use the "find_system" command to list virtual and non-virtual buses as seen below:

% finds all non-virtual blocks in the current system
>> non_virtual_block = find_system(gcs, 'FollowLinks', 'on', 'Virtual', 'off')

% finds all virtual blocks in the current system
>> virtual_block = find_system(gcs, 'FollowLinks', 'on', 'Virtual', 'on')

For more information on the "find_system" function, please consult the link below:

https://www.mathworks.com/help/simulink/slref/find_system.html

For more information on virtual versus non-virtual blocks, please consult the link below:

https://www.mathworks.com/help/simulink/ug/nonvirtual-and-virtual-blocks.html