The method getResult() does not exist on Zenstruck\ScheduleBundle\Schedule\Task. It seems like you code against a sub-type of Zenstruck\ScheduleBundle\Schedule\Task such as Zenstruck\ScheduleBundle\Tests\Fixture\MockTask.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation