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Having a junit run a piece of code for 1 min interval until it returns success

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Hi I m running tests that calls real API calls. I want to make sure the api endpoint returns 200 before I run the tests. I would want to retry couple of times every few mins if it returns 500 or 503. What is the best way to do this in junit. Any pointers appreciated.
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Is this a system test or a unit test? Are you verifying the functionality at the endpoint or that the endpoint is reachable and clients able to receive a response?

If you are just trying to test functionality, then you would be doing yourself a favor by testing at a finer grained level, without the network involved. If you are testing your configuration and infrastructure setup, then use a loop with some kind of counter for number of attempts to connect.
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