@Test
 public void nodesAfterEdges() {
   GraphWidget graph = parse("graph{1->2;2->3;2->4;1[label=\"node\"];2;3;4}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(4, graph.getNodes().size());
   Assert.assertEquals(3, graph.getConnections().size());
   Assert.assertEquals("node", ((GraphNode) graph.getNodes().get(0)).getText());
 }
 @Test
 public void multiEdgeStatements() {
   GraphWidget graph = parse("digraph{1->2->3->4}"); // $NON-NLS-1$
   assertEquals(4, graph.getNodes().size());
   assertEquals(3, graph.getConnections().size());
   /* Each node should be connected to one other, the next node: */
   assertEquals(1, ((GraphNode) graph.getNodes().get(0)).getSourceConnections().size());
   assertEquals(1, ((GraphNode) graph.getNodes().get(1)).getSourceConnections().size());
   assertEquals(1, ((GraphNode) graph.getNodes().get(2)).getSourceConnections().size());
 }
 @Test
 public void idsWithQuotes() {
   String dot = "graph{\"node 1\";\"node 2\"}"; // $NON-NLS-1$
   GraphWidget graph = parse(dot);
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(
       "node 1", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
   Assert.assertEquals(
       "node 2", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(1)).getText());
 }
 @Test
 public void fullyQuoted() {
   String dot = "graph{\"n1\";\"n2\";\"n1\"->\"n2\"}"; // $NON-NLS-1$
   GraphWidget graph = parse(dot);
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(2, graph.getNodes().size());
   Assert.assertEquals(1, graph.getConnections().size());
   Assert.assertEquals(
       "n1", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
   Assert.assertEquals(
       "n2", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(1)).getText());
 }
 @Test
 /* see http://www.graphviz.org/doc/info/attrs.html#d:style */
 public void edgeStyleInvis() {
   GraphWidget graph = parse("digraph{1->2[style=invis]}"); // $NON-NLS-1$
   assertEquals(2, graph.getNodes().size());
   assertEquals(1, graph.getConnections().size());
 }
 @Test
 public void nodesBeforeEdges() {
   GraphWidget graph = parse("graph{1;2;3;4; 1->2;2->3;2->4}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(4, graph.getNodes().size());
   Assert.assertEquals(3, graph.getConnections().size());
 }
 @Test
 public void headerCommentGraph() {
   GraphWidget graph = parse("/*A header comment*/\ngraph{1--2}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(2, graph.getNodes().size());
   Assert.assertEquals(1, graph.getConnections().size());
 }
 @Test
 public void globalNodeAttributeAdHocNodes() {
   GraphWidget graph = parse("graph{node[label=\"TEXT\"];1--2}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(
       "TEXT", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
 }
 @Test
 public void globalNodeLabel() {
   GraphWidget graph = parse("graph Sample{node[label=\"Node1\"];1;}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(
       "Node1", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
 }
 @Test
 public void nodeDefaultLabel() {
   GraphWidget graph = parse("graph Sample{1}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(
       "1", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
 }
 @Test
 public void undeclaredNodes() {
   GraphWidget graph =
       new GraphWidget(
           new DotImport("digraph{1->2;1->3}").newGraphInstance(), new Shell(), SWT.NONE);
   Assert.assertEquals(3, graph.getNodes().size());
   Assert.assertEquals(2, graph.getConnections().size());
 }
 @Test
 public void otherUnsupportedStyles() {
   GraphWidget graph =
       parse(
           "graph Sample{node[style=other];edge[style=other];1[style=other];2;1->2[style=other]}"); //$NON-NLS-1$
   assertEquals(2, graph.getNodes().size());
   assertEquals(1, graph.getConnections().size());
 }
 @Test
 public void clusterSubgraph() {
   Shell shell = new Shell();
   DotImport dotImport =
       new DotImport("digraph{subgraph cluster_1{1->2}; subgraph cluster_2{1->3}}");
   GraphWidget graph = new GraphWidget(dotImport.newGraphInstance(), shell, SWT.NONE);
   assertEquals("Cluster subgraphs are ignored in rendering", 3, graph.getNodes().size());
   assertEquals(2, graph.getConnections().size());
 }
 @Test
 public void useInterpreterTwice() {
   String dot = "graph{1;2;3;4; 1->2;2->3;2->4}"; // $NON-NLS-1$
   GraphWidget graph = parse(dot);
   graph = parse(dot);
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(4, graph.getNodes().size());
   Assert.assertEquals(3, graph.getConnections().size());
 }
 @Test
 public void newLinesInLabels() {
   String dot = "graph{n1[label=\"node\n1\"]}"; // $NON-NLS-1$
   GraphWidget graph = parse(dot);
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(
       "node\n1", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
 }
 @Test
 public void labelsWithQuotes() {
   String dot =
       "graph{n1[label=\"node 1\"];n2[label=\"node 2\"];n1--n2[label=\"edge 1\"]}"; //$NON-NLS-1$
   GraphWidget graph = parse(dot);
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(
       "node 1", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(0)).getText());
   Assert.assertEquals(
       "node 2", //$NON-NLS-1$
       ((GraphNode) graph.getNodes().get(1)).getText());
   Assert.assertEquals(
       "edge 1",
       ((GraphConnection)
               graph
                   .getConnections() //$NON-NLS-1$
                   .get(0))
           .getText());
 }
 @Test
 public void nodeCount() {
   GraphWidget graph = parse("graph Sample{1;2}"); // $NON-NLS-1$
   Assert.assertNotNull("Created graph must not be null", graph); // $NON-NLS-1$
   Assert.assertEquals(2, graph.getNodes().size());
 }