Add annotation to slower tests so devs can skip them #3491
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Description
This change registers an annotation to mark any test method as 'slow'. It also annotates test methods that take roughly a full second or longer.
After this change, if you want to run tests but skip the slower ones, you can use
-m 'not slow'
, as intox -- -m 'not slow'
orpytest -m 'not slow'
. The slow marker may also be useful to developers running individual test methods manually (one of the test methods annotated in this PR, for example, takes several minutes on my machine).However, by default, there is no intended change in behavior as a result of this PR -- all tests should still run locally and in CI by default.