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.time;
18  
19  import org.junit.jupiter.api.Assertions;
20  import org.junit.jupiter.api.BeforeEach;
21  import org.junit.jupiter.api.Test;
22  import org.orekit.Utils;
23  import org.orekit.utils.Constants;
24  
25  public class NavicScaleTest {
26  
27      @Test
28      public void testArbitrary() {
29          AbsoluteDate tNavIC =
30              new AbsoluteDate(new DateComponents(1999, 3, 4), TimeComponents.H00, TimeScalesFactory.getNavIC());
31          AbsoluteDate tUTC =
32              new AbsoluteDate(new DateComponents(1999, 3, 3), new TimeComponents(23, 59, 47),
33                               TimeScalesFactory.getUTC());
34          Assertions.assertEquals(tUTC, tNavIC);
35      }
36  
37      @Test
38      public void testConstant() {
39          TimeScale scale = TimeScalesFactory.getNavIC();
40          double reference = scale.offsetFromTAI(AbsoluteDate.J2000_EPOCH).toDouble();
41          for (double dt = -10000; dt < 10000; dt += 123.456789) {
42              AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
43              Assertions.assertEquals(reference, scale.offsetFromTAI(date).toDouble(), 1.0e-15);
44          }
45      }
46  
47      @Test
48      public void testSymmetry() {
49          TimeScale scale = TimeScalesFactory.getNavIC();
50          for (double dt = -10000; dt < 10000; dt += 123.456789) {
51              AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
52              double dt1 = scale.offsetFromTAI(date).toDouble();
53              DateTimeComponents components = date.getComponents(scale);
54              double dt2 = scale.offsetToTAI(components.getDate(), components.getTime()).toDouble();
55              Assertions.assertEquals( 0.0, dt1 + dt2, 1.0e-10);
56          }
57      }
58  
59      @Test
60      public void testDuringLeap() {
61          final TimeScale utc   = TimeScalesFactory.getUTC();
62          final TimeScale scale = TimeScalesFactory.getNavIC();
63          final AbsoluteDate before = new AbsoluteDate(new DateComponents(1983, 6, 30),
64                                                       new TimeComponents(23, 59, 59),
65                                                       utc);
66          final AbsoluteDate during = before.shiftedBy(1.25);
67          Assertions.assertEquals(61, utc.minuteDuration(during));
68          Assertions.assertEquals(1.0, utc.getLeap(during).toDouble(), 1.0e-10);
69          Assertions.assertEquals(60, scale.minuteDuration(during));
70          Assertions.assertEquals(0.0, scale.getLeap(during).toDouble(), 1.0e-10);
71      }
72  
73      @BeforeEach
74      public void setUp() {
75          Utils.setDataRoot("regular-data");
76      }
77  
78  }