Performance Testing Versus Unit Testing

General Tech QA/Testing 2 years ago

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Posted on 16 Aug 2022, this text provides information on QA/Testing related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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manpreet Tuteehub forum best answer Best Answer 2 years ago

I'm reading Osherove's "The Art of Unit Testing," and though I've not yet seen him say anything about performance testing, two thoughts still cross my mind:

  • Performance tests generally can't be unit tests, because performance tests generally need to run for long periods of time.
  • Performance tests generally can't be unit tests, because performance issues too often manifest at an integration or system level (or at least the logic of a single unit test needed to re-create the performance of the integration environment would be too involved to be a unit test).

Particularly for the first reason stated above, I doubt it makes sense for performance tests to be handled by a unit testing framework (such as NUnit).

My question is: do my findings / leanings correspond with the thoughts of the community?

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manpreet 2 years ago

I agree with your findings/learnings. True unit tests only test a portion of the system, ignoring, mocking or faking the rest as necessary. Integration tests (or regression tests) test most or all of the units working together, and that is the true measure of performance.


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manpreet 2 years ago

In some situations you can use unit tests to make sure that an operation finishes within a certain time period. If you want to add more features to your operation, but you don't want to sacrifice performance you can use unit tests to assert that. Of course, these kind of unit tests are machine dependent, but you can throw some additional variables or configuration to the equation.


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