/* Copyright 2022-2025 Romain Serra
    * 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.forces;
  
  import org.hipparchus.CalculusFieldElement;
  import org.hipparchus.geometry.euclidean.threed.FieldVector3D;
  import org.hipparchus.geometry.euclidean.threed.Vector3D;
  import org.hipparchus.util.Binary64;
  import org.junit.jupiter.api.Test;
  import org.orekit.propagation.FieldSpacecraftState;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.utils.ParameterDriver;
  
  import java.util.Collections;
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  class ForceModelTest {
  
      @Test
      void testGetMassDerivative() {
          // GIVEN
          final SpacecraftState mockedState = mock();
          final TestForce force = new TestForce();
          // WHEN
          final double massDerivative = force.getMassDerivative(mockedState, new double[0]);
          // THEN
          @SuppressWarnings("unchecked")
          final FieldSpacecraftState<Binary64> mockedFieldState = mock();
          when(mockedFieldState.getMass()).thenReturn(Binary64.ZERO);
          final Binary64 fieldMassDerivative = force.getMassDerivative(mockedFieldState, null);
          assertEquals(fieldMassDerivative.getReal(), massDerivative);
      }
  
      private static class TestForce implements ForceModel {
  
          @Override
          public boolean dependsOnPositionOnly() {
              return false;
          }
  
          @Override
          public Vector3D acceleration(SpacecraftState s, double[] parameters) {
              return null;
          }
  
          @Override
          public <T extends CalculusFieldElement<T>> FieldVector3D<T> acceleration(FieldSpacecraftState<T> s, T[] parameters) {
              return null;
          }
  
          @Override
          public List<ParameterDriver> getParametersDrivers() {
              return Collections.emptyList();
          }
      }
  }