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    *   http://www.apache.org/licenses/LICENSE-2.0
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  package org.orekit.estimation.measurements.modifiers;
  
  import org.hipparchus.geometry.euclidean.threed.Vector3D;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.orekit.Utils;
  import org.orekit.estimation.measurements.EstimatedMeasurement;
  import org.orekit.estimation.measurements.EstimatedMeasurementBase;
  import org.orekit.estimation.measurements.EstimationModifier;
  import org.orekit.estimation.measurements.ObservableSatellite;
  import org.orekit.estimation.measurements.QuadraticClockModel;
  import org.orekit.estimation.measurements.gnss.AmbiguityCache;
  import org.orekit.estimation.measurements.gnss.OneWayGNSSPhase;
  import org.orekit.gnss.PredefinedGnssSignal;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.propagation.analytical.tle.TLE;
  import org.orekit.propagation.analytical.tle.TLEPropagator;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.TimeScalesFactory;
  
  public class RelativisticClockOneWayGNSSPhaseModifierTest {
  
      /** Date. */
      private static AbsoluteDate date;
  
      /** Spacecraft states. */
      private static SpacecraftState[] states;
  
      @Test
      public void testRelativisticClockCorrection() {
  
          // Measurement
          final double wavelength = PredefinedGnssSignal.G01.getWavelength();
          final OneWayGNSSPhase phase = new OneWayGNSSPhase(states[1].getOrbit(), "",
                                                            new QuadraticClockModel(date, 0.0, 0.0, 0.0), date,
                                                            Vector3D.distance(states[0].getPosition(),
                                                                              states[1].getPosition()) / wavelength,
                                                            wavelength, 1.0, 1.0, new ObservableSatellite(0),
                                                            new AmbiguityCache());
  
          // One-way GNSS phase before applying the modifier
          final EstimatedMeasurementBase<OneWayGNSSPhase> estimatedBefore = phase.estimateWithoutDerivatives(states);
  
          // One-way GNSS phase before applying the modifier
          final EstimationModifier<OneWayGNSSPhase> modifier = new RelativisticClockOneWayGNSSPhaseModifier();
          phase.addModifier(modifier);
          final EstimatedMeasurement<OneWayGNSSPhase> estimatedAfter = phase.estimate(0, 0, states);
  
          // Verify
          Assertions.assertEquals(-10.57, (estimatedBefore.getEstimatedValue()[0] - estimatedAfter.getEstimatedValue()[0]) * wavelength, 1.0e-2);
          Assertions.assertEquals(0, modifier.getParametersDrivers().size());
          Assertions.assertEquals(1,
                                  estimatedAfter.getAppliedEffects().entrySet().stream().
                                  filter(e -> e.getKey().getEffectName().equals("clock relativity")).count());
  
      }
  
      @BeforeEach
      public void setUp() {
          // Data root
          Utils.setDataRoot("regular-data");
  
          // Date
          date = new AbsoluteDate("2004-01-13T00:00:00.000", TimeScalesFactory.getUTC());
  
          // Spacecraft states
          states = new SpacecraftState[2];
          final TLE local = new TLE("1 27642U 03002A   04013.91734903  .00000108  00000-0  12227-4 0  3621",
                                    "2 27642  93.9970   6.8623 0003169  80.1383 280.0205 14.90871424 54508");
          final TLE remote = new TLE("1 20061U 89044A   04013.44391333  .00000095  00000-0  10000-3 0  3242",
                                     "2 20061  53.4233 172.2072 0234017 261.4179  95.8975  2.00577231106949");
          states[0] = TLEPropagator.selectExtrapolator(local).propagate(date);
          states[1] = TLEPropagator.selectExtrapolator(remote).propagate(date);
      }
  
  }