1   /* Copyright 2002-2025 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.frames;
18  
19  import org.junit.jupiter.api.Assertions;
20  import org.junit.jupiter.api.Test;
21  import org.orekit.time.AbsoluteDate;
22  import org.orekit.utils.Constants;
23  
24  
25  public class FixedTransformProviderTest {
26  
27      @Test
28      public void testEME2000() {
29          Frame gcrf    = FramesFactory.getGCRF();
30          Frame eme2000 = FramesFactory.getEME2000();
31          TransformProvider fixed = new FixedTransformProvider(gcrf.getTransformTo(eme2000,
32                                                                                   AbsoluteDate.J2000_EPOCH));
33          for (double dt = 0; dt < Constants.JULIAN_YEAR; dt += Constants.JULIAN_DAY) {
34              final AbsoluteDate t = AbsoluteDate.J2000_EPOCH.shiftedBy(dt);
35              final Transform expectedIdentity =
36                              new Transform(t, fixed.getTransform(t), eme2000.getTransformTo(gcrf, t));
37              Assertions.assertEquals(0, expectedIdentity.getTranslation().getNorm(), 1.0e-15);
38              Assertions.assertEquals(0, expectedIdentity.getRotation().getAngle(), 1.0e-15);
39          }
40      }
41  
42  }