test harness input for "read from file"

Question

Bertug 2023-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/2056174-test-harness-input-for-read-from-file

回答： Guilherme Costa Nascimento 2023-12-5

Hi. I have a simulation which captures a .png file and creates share 1 and share 2. I need to use test harness for my homework. In order to test the subsystem, I need to use input data, baseline criteria etc.

But, my input data is not a logical signal or not a sinus signal. It's an image data. As you see my simulink:

And i need to specify an input in order to test the system:

What kind of input do I need to use?

I also need to determine a baseline criteria so that I can understand whether the subsystem is working or not :

Can you please give me advices? How can I understand my test scenario is succesful?

Thanks in advance.

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Answer 1

Guilherme Costa Nascimento 2023-12-5

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Hi Bertug,

As you are using image files, you need to use the "Parameter Overrides" section to change the name of the image you are importing with the Image From File block. This will take the place of the input and you can leave the "Inputs" section of the test case empty. See this doc page for more details: https://www.mathworks.com/help/sltest/ug/specify-test-properties-in-the-test-manager.html#bulu9hh

As for determining if your test passed or failed, "Baseline Criteria" is just one way to do it. The best approach will depend on how you assess whether your test passes or not. One option is to do any necessary post processing in the test harness with Simulink blocks, and then compare then expected output with your block output using an Assertion block. Another option is to use a Test Assessment block. This example here should be helpful: https://www.mathworks.com/help/sltest/ug/connecting-blocks-for-verify-statements.html

Hope this helps.