Is it possible to access the blocks inside the model under test from the test harness in custom criteria script of simulink test?

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Jerome Almon 2024-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/2144974-is-it-possible-to-access-the-blocks-inside-the-model-under-test-from-the-test-harness-in-custom-crit

评论： Fangjun Jiang 2024-8-13

I would like to verify the datatype of inports and outports of a model in simulink test. So I created a test harness for it and when I try to access the inports inside the model under test in test harness from the custom cirteria script of simulink test, it doesnt work.

function ioAnalysisFunc(test)

res = get_param(strcat(test.sltest_bdroot, '/Model1/Inport1'), 'OutDataTypeStr'); % Here test.sltest_bdroot is the test harness 'Model1_Harness'

assignin('base', 'ress_out', res{1});

end

The error thrown is,

--------------------------------------------------------------------

Error occurred in custom criteria and custom criteria assessment did not run to completion.

--------- Error ID: ---------

Simulink:Commands:InvSimulinkObjectName

-------------- Error Details: --------------

Invalid Simulink object name: 'Model1_Harness/Model1/Inport1'.

--------------------------------------------------------------------

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Answer 1

Fangjun Jiang 2024-8-13

I think the testing harness model is using the Model block to reference the model under test, so you can't access the block directly like that inside a model reference.

I would suggest getting the data type of the signal that is feeding into "Inport1". In most cases, it is the same as the data type of the output of "Inport1".

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Jerome Almon 2024-8-13

编辑：Jerome Almon 2024-8-13

Thanks for your reply. This is what I am doing right now. (Getting the datatype of the input signal using the simulation output log in custom criteria script.)

However it would be really useful if there exists a way to access the blocks inside the model under test. Ofcourse not to modify anything, but ony read access (eg. get_param()) should be good enough. Since we decided to maintain the whole UT only using simulink test, this feature would be really helpful. Is it not possible at all ? Or is there any other alternative to read the properties of the blocks inside the model under test from simulink test ? Thank you.

Fangjun Jiang 2024-8-13

Not sure if you are familar with Model Reference. Modle under test is referenced this way.

https://www.mathworks.com/help/simulink/model-reference.html

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Is it possible to access the blocks inside the model under test from the test harness in custom criteria script of simulink test?

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