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Tests: Make email-domain coverage deterministic by mocking #20284

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@JacobCoffee

https://github.com/pypi/warehouse/actions/runs/29690472841/job/88202227081 all tests pass but coverage failed I think because of some network flakiness (?)

DNS succeeded in the pr run -> PTR lines executed > 100% coverage.
then dns failed after merge -> the error was suppressed -> tests still passed, but PTR lines were skipped -> 99% coverage. (?)

Mock both of these calls in the relevant unit test:

  • `dns.resolver.resolve``
  • dns.resolver.resolve_address

Do not use pretend.


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