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    *   http://www.apache.org/licenses/LICENSE-2.0
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  package org.orekit.forces.maneuvers.trigger;
  
  import java.util.Collections;
  import java.util.List;
  
  import org.hipparchus.CalculusFieldElement;
  import org.hipparchus.Field;
  import org.hipparchus.util.Binary64Field;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.propagation.events.DateDetector;
  import org.orekit.propagation.events.FieldAbstractDetector;
  import org.orekit.propagation.events.FieldDateDetector;
  import org.orekit.propagation.events.FieldEventDetector;
  import org.orekit.propagation.events.handlers.StopOnEvent;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  import org.orekit.time.TimeStamped;
  import org.orekit.utils.ParameterDriver;
  
  public class StartStopEventTriggerTest extends AbstractManeuverTriggersTest<StartStopEventsTrigger<DateDetector, DateDetector>> {
  
      public static class StartStopDates extends StartStopEventsTrigger<DateDetector, DateDetector> {
  
          public StartStopDates(final AbsoluteDate start, final AbsoluteDate stop) {
              super(new DateDetector(start, stop.shiftedBy(10.0)).
                    withMaxCheck(5.0).
                    withThreshold(1.0e-10).
                    withHandler(new StopOnEvent()),
                    new DateDetector(stop, stop.shiftedBy(20.0)).
                    withMaxCheck(5.0).
                    withThreshold(1.0e-10).
                    withHandler(new StopOnEvent()));
          }
  
          @Override
          protected <D extends FieldEventDetector<S>, S extends CalculusFieldElement<S>>
              D convertStartDetector(Field<S> field, DateDetector detector) {
              final FieldAbsoluteDate<S> target = new FieldAbsoluteDate<>(field, detector.getDates().get(0).getDate());
              @SuppressWarnings("unchecked")
              final D converted = (D) new FieldDateDetector<>(field, target);
              return converted;
          }
  
          @Override
          protected <D extends FieldEventDetector<S>, S extends CalculusFieldElement<S>>
          D convertStopDetector(Field<S> field, DateDetector detector) {
              final FieldAbsoluteDate<S> target = new FieldAbsoluteDate<>(field, detector.getDates().get(0).getDate());
              @SuppressWarnings("unchecked")
              final D converted = (D) new FieldDateDetector<>(field, target);
              return converted;
          }
  
          @Override
          public List<ParameterDriver> getParametersDrivers() {
              return Collections.emptyList();
          }
  
      }
  
      protected StartStopEventsTrigger<DateDetector, DateDetector> createTrigger(final AbsoluteDate start, final AbsoluteDate stop) {
          return new StartStopDates(start, stop);
      }
  
      @Test
      void testComponents() {
          StartStopEventsTrigger<DateDetector, DateDetector> trigger = createTrigger(AbsoluteDate.J2000_EPOCH,
                                                                                     AbsoluteDate.J2000_EPOCH.shiftedBy(100.0));
          final List<TimeStamped>    startDates = trigger.getStartDetector().getDates();
          final List<TimeStamped>    stopDates  = trigger.getStopDetector().getDates();
          Assertions.assertEquals(2,     trigger.getEventDetectors().count());
          Assertions.assertEquals(2,     trigger.getFieldEventDetectors(Binary64Field.getInstance()).count());
          Assertions.assertEquals(2,     startDates.size());
          Assertions.assertEquals(  0.0, startDates.get(0).getDate().durationFrom(AbsoluteDate.J2000_EPOCH), 1.0e-10);
          Assertions.assertEquals(110.0, startDates.get(1).getDate().durationFrom(AbsoluteDate.J2000_EPOCH), 1.0e-10);
          Assertions.assertEquals(2,     stopDates.size());
          Assertions.assertEquals(100.0, stopDates.get(0).getDate().durationFrom(AbsoluteDate.J2000_EPOCH), 1.0e-10);
          Assertions.assertEquals(120.0, stopDates.get(1).getDate().durationFrom(AbsoluteDate.J2000_EPOCH), 1.0e-10);
      }
  
  }