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Ever work?
Disturbingly, yes
Every sufficiently complicated system is indistinguishable from being alive, and living beings need some warm-up time.
All the time. Causes include:
- Test depends on an external system (database, package manager)
- Race conditions
- Failing the test cleared bad state (test expects test data not to be in the system and clears it when it exits)
- Failing test set up unknown prerequisite (Build 2 tests depends on changes in Build 1 but build system built them out of order)
- External forces messing with the test runner (test machine going to sleep or running out of resources)
We call those "flaky tests" and only fail a build if a given test cannot pass after 2 retries. (We also flag the test runs for manual review)
I mean
maybe
Not with code, but i write a lot of LaTeX and that often starts working on second compilation
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