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    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.orekit.propagation.conversion;
  
  import org.hipparchus.linear.ArrayRealVector;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  import org.orekit.Utils;
  import org.orekit.frames.Frame;
  import org.orekit.frames.FramesFactory;
  import org.orekit.orbits.KeplerianOrbit;
  import org.orekit.orbits.PositionAngleType;
  import org.orekit.propagation.Propagator;
  import org.orekit.propagation.analytical.KeplerianPropagator;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.utils.Constants;
  import org.orekit.utils.ParameterDriver;
  import org.orekit.utils.ParameterDriversList;
  
  /**
   * Unit tests for {@link FiniteDifferencePropagatorConverter}.
   *
   * @author Evan Ward
   */
  public class FiniteDifferencePropagatorConverterTest {
  
      /** Set Orekit data . */
      @BeforeAll
      public static void setUp() {
          Utils.setDataRoot("regular-data");
      }
  
      /**
       * Test case for bug #362. Check that scaling is only applied once.
       */
      @Test
      public void testGetObjectiveFunctionParametersOnlyScaledOnce() {
          // setup
          // create some arbitrary sample data to run with
          Frame eci = FramesFactory.getGCRF();
          double gm = Constants.EIGEN5C_EARTH_MU;
          AbsoluteDate date = AbsoluteDate.J2000_EPOCH;
          Propagator source = new KeplerianPropagator(new KeplerianOrbit(
                  6878137, 0, 0, 0, 0, 0, PositionAngleType.TRUE, eci, date, gm));
          // Create a mock builder that allows us to check the values passed to it
          PropagatorBuilder builder = Mockito.mock(PropagatorBuilder.class);
          ParameterDriversList list = new ParameterDriversList();
          list.add(new ParameterDriver("p1", 0, 1e-3, Double.NEGATIVE_INFINITY,
                  Double.POSITIVE_INFINITY));
          Mockito.when(builder.getOrbitalParametersDrivers()).thenReturn(list);
          Mockito.when(builder.getPropagationParametersDrivers())
                  .thenReturn(new ParameterDriversList());
          Mockito.when(builder.getFrame()).thenReturn(eci);
          Mockito.when(builder.getSelectedNormalizedParameters()).thenReturn(new double[1]);
          Mockito.when(builder.buildPropagator(Mockito.any(double[].class)))
                  .thenReturn(source);
          // subject under test
          FiniteDifferencePropagatorConverter converter =
                  new FiniteDifferencePropagatorConverter(builder, 1, 100);
          // set some internal variables in FDPC that are not settable using another
          // interface
          converter.convert(source, 1, 2);
          // Forget all the side effect of the call to convert()
          Mockito.clearInvocations(builder);
  
          // action
          converter.getModel().value(new ArrayRealVector(1));
  
          // verify
          Mockito.verify(builder).buildPropagator(new double[]{0});
          Mockito.verify(builder).buildPropagator(new double[]{1});
      }
  
  }