Not pausing on error in unit test
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Not pausing on error with debugger while running unit test. Please advise.
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Steven Lord
2022-7-15
I believe that the test infrastructure runs your tests effectively in a try / catch block and so an error breakpoint set to pause on errors will not be triggered.
Looking at the documentation for running tests in the Editor in various releases from release R2020b to the current release, it appears that the ability to specify the option to apply debugging capabilities when running tests from within the Editor was introduced in release R2022a. See the "Debug" row of the testing options table on this documentation page.
If you were running the test using runtests in the Command Window, that allows you to specify the name-value pair argument 'Debug' and tell MATLAB to enter debug mode when a test failure occurs in both releases R2020b and R2022a.
But now that I reread your question, are you asking how to stop and allow debugging when a test failure occurs, or are you asking how to stop and allow debugging when your test throws a hard error rather than a failure? In the latter case you may need to run this command before running your test:
dbstop if caught error
I caution you, though, that this may put you in the debugger in a file that is part of the testing infrastructure rather than the test file itself. To avoid this you may want to explicitly put a breakpoint in the test file on the line immediately before the error occurs and then begin your debugging process from that point, before the test actually reaches the line of code where the error is thrown.
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Joris
2023-9-8
编辑:Joris
2023-9-8
During a unit test, the debugger will not stop on errors since everything is in a big try catch block because of the unit test.
You need to tell the debugger to 'Pause on Caught Errors'. But wait, that option is not available? It was a default option in the past and has disappeared. You need to manually set it back on again, see this link. Basically put this in your Command Window:
>> s = settings;
>> s.matlab.editor.displaysettings.ShowPauseOnCaughtErrorOption.PersonalValue = 1;
The option will appear again and presto, your unit test can be stopped right there and when the code crashes, not during the previous 999 loops that ran fine.
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