Brian Hulette created BEAM-10761:
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             Summary: Add TestPubsub.waitForSubscription
                 Key: BEAM-10761
                 URL: https://issues.apache.org/jira/browse/BEAM-10761
             Project: Beam
          Issue Type: Improvement
          Components: io-java-gcp, testing
            Reporter: Brian Hulette
            Assignee: Brian Hulette


We have several tests that rely on TestPubsubSignal.signalStart as an imperfect 
signal that a pipeline has created a subscription to a PubSub topic, and it is 
safe for us to start injecting data. This has the potential to be flaky.

We should instead poll pubsub until we can observe a subscription was created. 
This can be implemented via a method TestPubsub.waitForSubscription



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