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The postman.setNextRequest() method can be used to control the flow to a test other than the next test in the list . See (see this blog on Postman Conditional Workflows and even better for more). But even better, it can be used to stop a collection run saving the user the pain of looking at a series of tests fail because an earlier test in the run failed.
For example, assume a data domain is created at the start of a test run and is required for the following tests in a Postman collection run, this code block in the request's test script will stop the run if the domain is not created:
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