package org.orekit.rugged.adjustment;
   
   import java.lang.reflect.Field;
   
   import org.junit.jupiter.api.Assertions;
   import org.junit.jupiter.api.Test;
   
   public class LeastSquareAdjusterTest {
   
      @Test
      public void testLeastSquareAdjuster() throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
          
          final LeastSquareAdjuster adjusterWithOptimizer = new LeastSquareAdjuster(OptimizerId.GAUSS_NEWTON_QR);
          final LeastSquareAdjuster adjusterWithDefaultOptimizer = new LeastSquareAdjuster();
          
          Field optimizerIdWithOptimizer = adjusterWithOptimizer.getClass().getDeclaredField("optimizerID");
          optimizerIdWithOptimizer.setAccessible(true);
          OptimizerId getOptimizerIdWithOptimizer = (OptimizerId) optimizerIdWithOptimizer.get(adjusterWithOptimizer);
  
          Field optimizerIdWithDefaultOptimizer = adjusterWithDefaultOptimizer.getClass().getDeclaredField("optimizerID");
          optimizerIdWithDefaultOptimizer.setAccessible(true);
          OptimizerId getOptimizerIdWithDefaultOptimizer = (OptimizerId) optimizerIdWithDefaultOptimizer.get(adjusterWithDefaultOptimizer);
  
          Assertions.assertTrue(getOptimizerIdWithDefaultOptimizer == getOptimizerIdWithOptimizer);
      }
  }