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    *
    *   http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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  package org.orekit.propagation.conversion;
  
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  import org.orekit.Utils;
  import org.orekit.errors.OrekitException;
  import org.orekit.errors.OrekitMessages;
  import org.orekit.orbits.PositionAngle;
  import org.orekit.propagation.analytical.tle.TLE;
  import org.orekit.propagation.analytical.tle.TLEPropagator;
  import org.orekit.utils.ParameterDriver;
  
  public class TLEConverterTest {
  
      @Test
      public void testDeselectOrbitals() {
  
          final TLE tle = new TLE("1 27508U 02040A   12021.25695307 -.00000113  00000-0  10000-3 0  7326",
                                  "2 27508   0.0571 356.7800 0005033 344.4621 218.7816  1.00271798 34501");
          
          TLEPropagatorBuilder builder = new TLEPropagatorBuilder(tle, PositionAngle.MEAN, 1.0);
          for (ParameterDriver driver : builder.getOrbitalParametersDrivers().getDrivers()) {
              Assert.assertTrue(driver.isSelected());
          }
          builder.deselectDynamicParameters();
          for (ParameterDriver driver : builder.getOrbitalParametersDrivers().getDrivers()) {
              Assert.assertFalse(driver.isSelected());
          }
      }
  
      @Test
      public void testIssue859() {
  
          // INTELSAT 25 TLE taken from Celestrak the 2021-11-24T07:45:00.000
          // Because the satellite eccentricity and inclination are closed to zero, this satellite
          // reach convergence issues when converting the spacecraft's state to TLE.
          final TLE tle = new TLE("1 33153U 08034A   21327.46310733 -.00000207  00000+0  00000+0 0  9990",
                                  "2 33153   0.0042  20.7353 0003042 213.9370 323.2156  1.00270917 48929");
  
          // Verify convergence issue
          final TLEPropagatorBuilder propagatorBuilderError = new TLEPropagatorBuilder(tle, PositionAngle.MEAN, 1.);
          try {
              propagatorBuilderError.buildPropagator(propagatorBuilderError.getSelectedNormalizedParameters());
          } catch (OrekitException oe) {
              Assert.assertEquals(OrekitMessages.UNABLE_TO_COMPUTE_TLE, oe.getSpecifier());
          }
  
          // Now try using different convergence threshold
          final TLEPropagatorBuilder propagatorBuilder = new TLEPropagatorBuilder(tle, PositionAngle.MEAN, 1., 2.0e-4, 10000);
          final TLEPropagator propagator = propagatorBuilder.buildPropagator(propagatorBuilderError.getSelectedNormalizedParameters());
          final TLE newTLE = propagator.getTLE();
  
          // Verify
          Assert.assertEquals(0.0, newTLE.getDate().durationFrom(tle.getDate()), Utils.epsilonTest);
  
      }
  
      @Before
      public void setUp() {
          Utils.setDataRoot("regular-data");
      }
  
  }