  @Test
  public void testJavaSystem() {

    JavaSystem js = new JavaSystem();
    JavaSourceNode jsn = (JavaSourceNode) js.moveTo(
        "../simplegraph-java/src/test/java/com/bitplan/simplegraph/java/TestJavaSystem.java");
    debug = true;
    if (debug) {
      js.forAll(SimpleNode.printDebug);
      CompilationUnit cu = jsn.compilationUnit;
      cu.walk(node -> {
        System.out.println(node.getClass().getName());
      });
    }
    MethodDeclaration md = (MethodDeclaration) js.g().V()
        .hasLabel("MethodDeclaration").has("name", "testJavaSystem").next()
        .property("node").value();
    assertTrue(md.getComment().isPresent());
    assertTrue(md.getComment().get().getContent()
        .contains("test for the Java System"));
  }