docs: Clarify scope of jest.setTimeout #9676
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Summary
It was not clear to me what scope the effect of calling
jest.setTimeout(timeout)would have, i.e. whether the default timeout would change only for the test file or describe block where the call originated or for all tests executed after the call.Test plan
The behavior that I describe here was reverse-engineered by experiment, since I could not immediately find the implementation of it. So it would be great to have my findings confirmed by someone who understands the implementation.