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  package org.orekit.estimation.measurements.gnss;
  
  import org.hipparchus.linear.MatrixUtils;
  import org.hipparchus.linear.RealMatrix;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.gnss.PredefinedGnssSignal;
  import org.orekit.utils.ParameterDriver;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class AmbiguitySolverTest {
  
      @Test
      public void testJoostenTiberiusFAQ() {
          // this test corresponds to the "LAMBDA: FAQs" paper by Peter Joosten and Christian Tiberius
  
          final List<ParameterDriver> ambiguitiesDrivers = createAmbiguities(5.450, 3.100, 2.970);
          final RealMatrix covariance = MatrixUtils.createRealMatrix(new double[][] {
              { 6.290, 5.978, 0.544 },
              { 5.978, 6.292, 2.340 },
              { 0.544, 2.340, 6.288 }
          });
  
          // acceptance ratio not met
          Assertions.assertTrue(new AmbiguitySolver(ambiguitiesDrivers, new LambdaMethod(),
                                                new SimpleRatioAmbiguityAcceptance(0.5)).
                            fixIntegerAmbiguities(0, ambiguitiesDrivers, covariance).
                            isEmpty());
  
          List<ParameterDriver> fixed = new AmbiguitySolver(ambiguitiesDrivers, new LambdaMethod(),
                                                            new SimpleRatioAmbiguityAcceptance(0.8)).
                                        fixIntegerAmbiguities(0, ambiguitiesDrivers, covariance);
          Assertions.assertEquals(3, fixed.size());
          Assertions.assertEquals(5, fixed.get(0).getValue(), 1.0e-15);
          Assertions.assertEquals(3, fixed.get(1).getValue(), 1.0e-15);
          Assertions.assertEquals(4, fixed.get(2).getValue(), 1.0e-15);
      }
  
      private List<ParameterDriver> createAmbiguities(double...floatValues) {
          final AmbiguityCache cache = new AmbiguityCache();
          final List<ParameterDriver> ambiguitiesDrivers = new ArrayList<>(floatValues.length);
          for (int i = 0; i < floatValues.length; ++i) {
              final ParameterDriver driver = cache.getAmbiguity("emitter-" + i, "receiver",
                                                                PredefinedGnssSignal.E01.getWavelength());
              driver.setValue(floatValues[i]);
              driver.setSelected(true);
              ambiguitiesDrivers.add(driver);
          }
          return ambiguitiesDrivers;
      }
  
  }