This setup and take down I've seen account for literally 99.9%+ of the execution time in testing.
I can confirm this based on my experience too. For example, let's say you're working on a large Ruby on Rails web app, tens of thousands of LoC. The default approach when writing any new piece of test code is to include a test helper which basically adds the complete monolith as a dependency to your test. This isn't always necessary, some code can stand alone.
On a more granular level, a new test case that you're writing may not need all the data that other tests in the file need to load, etc. It's all about thinking a little more carefully about what we're doing.
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I can confirm this based on my experience too. For example, let's say you're working on a large Ruby on Rails web app, tens of thousands of LoC. The default approach when writing any new piece of test code is to include a test helper which basically adds the complete monolith as a dependency to your test. This isn't always necessary, some code can stand alone.
On a more granular level, a new test case that you're writing may not need all the data that other tests in the file need to load, etc. It's all about thinking a little more carefully about what we're doing.