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Description
Is your feature request related to a problem? Please describe.
TestWorkflowEnvironment supports a SetStartTime method which allows one to set the start time of the workflow during testing. It would be great if such a feature exists for TestActivityEnvironment so similar start time related features can be tested properly.
Describe the solution you'd like
TestActivityEnvironment to support SetStartTime
Describe alternatives you've considered
passing in start time for activity as parameter, but this is not encouraged as it could be imprecise due to worker coordination.
Additional context