source: class YasglHelperTest {
  
      public static final String TEST_EMPTY_FILE_PATH;
      public static final String TEST_EDGE_FILE_PATH;
      public static DirectedGraphBuilder builder;
      public static YasglHelper yasgl;
      public static DirectedGraph graph;
      public static File emptyfile;
      public static File edgefile;
      public static Collection<Edge<String>> edges;
      public static Edge<String> edge;
  
      @Test
      public void addEdgeToGraphTest() throws Exception {
  
target:         String[] edgesToAdd = {"1 2"};
          edges = addEdgeToGraph(edgesToAdd);
          edge = new Edge<String>("1", "2");
          assertTrue(edges.contains(edge));
      }
  
  }