assertTrue(hasEdge(graph5, "a", "b"));
        assertTrue(hasEdge(graph5, "b", "c"));
        assertTrue(hasEdge(graph5, "b", "f"));
        assertTrue(hasEdge(graph5, "f", "g"));
        assertTrue(hasEdge(graph5, "g", "h"));
        assertTrue(hasEdge(graph5, "c", "d"));
        assertTrue(hasEdge(graph5, "d", "e"));
        assertFalse(hasEdge(graph5, "e", "b"));
    }

    @Test

        boolean hasEdge = graph.hasEdgeConnecting(node, otherNode);
        assertThat(hasEdge).isEqualTo(asGraph.hasEdgeConnecting(node, otherNode));
        assertThat(graph.edgeValueOrDefault(node, otherNode, null) != null).isEqualTo(hasEdge);
        assertThat(!graph.edgeValueOrDefault(node, otherNode, DEFAULT).equals(DEFAULT))
            .isEqualTo(hasEdge);
      }
    }
  }

  @Test

        boolean hasEdge = graph.hasEdgeConnecting(node, otherNode);
        assertThat(hasEdge).isEqualTo(asGraph.hasEdgeConnecting(node, otherNode));
        assertThat(graph.edgeValueOrDefault(node, otherNode, null) != null).isEqualTo(hasEdge);
        assertThat(!graph.edgeValueOrDefault(node, otherNode, DEFAULT).equals(DEFAULT))
            .isEqualTo(hasEdge);
      }
    }
  }

  @Test

addEdge(String, String) throws CycleDetectedExcepti; public void addEdge(Vertex, Vertex) throws CycleDetectedExcepti; public void removeEdge(String, String); public void removeEdge(Vertex, Vertex); public Vertex getVertex(String); public boolean hasEdge(String, String); public java.util.List getChildLabels(String); public java.util.List getParentLabels(String); public Object clone() throws CloneNotSupportedExc; public boolean isConnected(String); public java.util.List getSuccessorLabels(String);...