Add Test.isRunning to let code determine if Swift Testing is active.
#514
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This PR adds a `Test.isRunning` static property that tells the caller if _any_ thread/task/queue/etc. is currently running Swift Testing code. This property is distinct from `Test.current` because that property has a value of `nil` on detached tasks. Resolves #475.
grynspan
added
enhancement
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This PR adds a
Test.isRunningstatic property that tells the caller if any thread/task/queue/etc. is currently running Swift Testing code. This property is distinct fromTest.currentbecause that property has a value ofnilon detached tasks.Resolves #475.
Checklist: