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Unit testing with externally configurable parameters.

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John
John on 13 Jan 2021
Commented: John on 13 Jan 2021
I am exploring Matlab's unit testing framework and I'd like to use it with a project that involves communicating with an external device connected through a serial port.
I currently have a wrapper class that encapsulates the serial interface (and the accompanying protocol implementation). This is a handle class, and contains a serial object as one of its properties. Additionally, the constructor will open the serial connection, and the destructor will close and delete it.
So in general usage I'd do something like:
my_obj = my_class('com1'); %Set up object connected to com1
my_obj.method1;
my_obj.method2;
delete(my_obj); %Destructor will close the serial object and then delete it.
Now my question. I'd like to write some unit tests (using the Matlab Testing framework). How can I set these tests up, but specify the com-port external to the test functions/scripts? Is there a way to instantiate my_obj, and then give a set of tests access to the specific my_obj?
Additional thoughts:
  • I do not want to hard-code the com-port in any of the test definitions.
  • Class-based unit tests don't seem to have conventional constructors (or a way of explicitly instantiating my_obj)
  • Function-based tests suggest that you can share information through the TestCase.TestData, but that only seems to be possible within the sub-tests that make up a test file.
  • I suppose I could get around this by loading a text/mat configuration file or checking an environment variable in the file fixtures, but that seems inelegant.
Thanks for your help.

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Accepted Answer

Steven Lord
Steven Lord on 13 Jan 2021
Write a parameterized test whose parameter is the port name. Inject a value for that parameter into the test when you create the test suite. See this documentation page for more information.

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John
John on 13 Jan 2021
Okay. That looks like it will accomplish what I'm looking for. Thanks for the suggestion!
I had come across the documentation for conventional parameterized tests, but they seemed to be geared towards iterating through various combinations of specific property values.

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