package org.codehaus.plexus.util.dag;
   
   import org.junit.jupiter.api.Test;
   
   import static org.junit.jupiter.api.Assertions.assertEquals;
   
   /**
    * <p>VertexTest class.</p>
    *
   * @author <a href="michal.maczka@dimatics.com">Michal Maczka</a>
   * @since 3.4.0
   */
  class VertexTest {
  
      @Test
      void vertex() {
  
          final Vertex vertex1 = new Vertex("a");
  
          assertEquals("a", vertex1.getLabel());
  
          assertEquals(0, vertex1.getChildren().size());
  
          assertEquals(0, vertex1.getChildLabels().size());
  
          final Vertex vertex2 = new Vertex("b");
  
          assertEquals("b", vertex2.getLabel());
  
          vertex1.addEdgeTo(vertex2);
  
          assertEquals(1, vertex1.getChildren().size());
  
          assertEquals(1, vertex1.getChildLabels().size());
  
          assertEquals(vertex2, vertex1.getChildren().get(0));
  
          assertEquals("b", vertex1.getChildLabels().get(0));
      }
  }