on
  Adds a closure to be notified when output from the test received. A TestDescriptor and TestOutputEvent instance are passed to the closure as a parameter.
apply plugin: 'java'
test {
   onOutput { descriptor, event ->
       if (event.destination == TestOutputEvent.Destination.StdErr) {
           logger.error("Test: " + descriptor + ", error: " + event.message)
       }
   }
}
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Parameters
closure
The closure to call.