How to use Camel with Spock's PollingConditions

camel-with-spock.groovy

@Test
public void should_filter_out_messages_with_missing_durations() {
    template.sendBodyAndHeaders("solr://<some solr server>", [someInputData(), someOtherInputData()], headers)
    
    new PollingConditions(timeout: 10, initialDelay: 1.5, factor: 1.25).eventually {
        assert solr.received.size() == 1
    }
        
    assert solr.received.first().body.contains(<some string>)
}