Testing Elixir: Mox mode is private since the test is running with async (page 84-)
Andrea Leopardi (@whatyouhide) and Jeffrey Matthias (@idlehands),
SoggyWaffle.WeatherCheckerTest is using the :set_mox_from_context setup function, this means that Mox will run in private mode since async: true is passed to ExUnit.Case as an option. This causes a Mox.UnexpectedCallError when running the test.
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