/* Copyright 2002-2025 CS GROUP
    * 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.gravity.potential;
  
  import org.hipparchus.util.FastMath;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  public class OceanLoadDeformationCoefficientsTest {
  
      @Test
      void testIERS1996EqualsIERS2003()
          {
          double[] coeff1996 = OceanLoadDeformationCoefficients.IERS_1996.getCoefficients();
          double[] coeff2003 = OceanLoadDeformationCoefficients.IERS_2003.getCoefficients();
          Assertions.assertEquals(coeff1996.length, coeff2003.length);
          for (int i = 0; i < coeff1996.length; ++i) {
              Assertions.assertEquals(coeff1996[i], coeff2003[i], 1.0e-15);
          }
      }
  
      @Test
      void testIERS1996EqualsIERS2010()
          {
          double[] coeff1996 = OceanLoadDeformationCoefficients.IERS_1996.getCoefficients();
          double[] coeff2010 = OceanLoadDeformationCoefficients.IERS_2010.getCoefficients();
          Assertions.assertEquals(coeff1996.length, coeff2010.length);
          for (int i = 0; i < coeff1996.length; ++i) {
              Assertions.assertEquals(coeff1996[i], coeff2010[i], 1.0e-15);
          }
      }
  
      @Test
      void testGegoutHighDegree()
          {
          Assertions.assertEquals(251, OceanLoadDeformationCoefficients.GEGOUT.getCoefficients().length);
      }
  
      @Test
      void testGegoutNotEqualToIERS()
          {
          double[] coeff1996   = OceanLoadDeformationCoefficients.IERS_1996.getCoefficients();
          double[] coeffGegout = OceanLoadDeformationCoefficients.GEGOUT.getCoefficients();
          for (int i = 0; i < coeff1996.length; ++i) {
              if (coeff1996[i] == 0) {
                  Assertions.assertEquals(0.0, coeffGegout[i], 1.0e-15);
              } else {
                  Assertions.assertTrue(FastMath.abs(coeff1996[i] - coeffGegout[i]) > FastMath.abs(coeff1996[i]) / 200);
              }
          }
      }
  
  }