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If a global error event is dispatched during a test, Jest reports that test as a failure. Our `@gate` pragma feature should account for this — if the gate condition is false, and the global error event is dispatched, then the test should be reported as a success. The solution is to install an error event handler right before invoking the test function. Because we install our own handler, Jest will not report the test as a failure if a global error event is dispatched; it's conceptually as if we wrapped the whole test event in a try-catch.