code: package org.rug.simpletests.data.smells;
  
  import org.junit.jupiter.api.Tag;
  import org.junit.jupiter.api.Test;
  import org.rug.data.characteristics.comps.JarSourceCodeRetriever;
  
  import java.io.File;
  
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Tag("unitTests")
  public class JarSourceCodeRetrieverTest {
  
      @Test
      void getClassSource() {
          JarSourceCodeRetriever retriever = new JarSourceCodeRetriever(new File("test-data/jars/astracker-0.7.jar").toPath());
          var oracle = "public class JarClassSourceCodeRetrieval\nextends ClassSourceCodeRetriever {";
          var src = retriever.getSource("org.rug.data.characteristics.comps.JarClassSourceCodeRetrieval");
          assertFalse(src.isEmpty());
          assertTrue(src.contains(oracle));
      }
  }