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Add smoke tests to test every commit on a Catalina host. (#38567)

* Add a smoke test to test every commit on a Catalina host.
* Also add a hot-reload test.

Related issue: #36290.
T
Tong Wu committed
066738324ea3b2d010dce27d63437742b190cda3
Parent: a56dfaf
Committed by GitHub <noreply@github.com> on 8/14/2019, 10:09:35 PM