fix

test/Graph.ts

@@ -1,5 +1,5 @@
 import test from 'ava';
-import { Graph, GraphStyles, Color, NodeStyles } from '../lib';
+import { Graph, GraphStyles, Color, NodeStyles, GraphLayouts } from '../lib';
 
 const result = `digraph foo {
   subgraph cluster_foo_baz {
@@ -39,6 +39,14 @@ const non_directional = `graph foo {
   foo_bar_baz -- foo_foo
 }`;
 
+const attributes = `digraph attr {
+  color = #000000
+  style = bold
+  overlap = false
+  splines = true
+  layout = neato
+}`;
+
 test ('serialize', (t) => {
   const g = new Graph ('foo');
 
@@ -70,6 +78,7 @@ test ('serialize', (t) => {
 
   const baz = g.add_node ('baz');
   const foo = g.add_node ('foo');
+
   g.add_edge (foo, baz);
 
   const serialized = g.toString ();
@@ -79,6 +88,7 @@ test ('serialize', (t) => {
 
 test ('non directional', (t) => {
   const g = new Graph ('foo');
+
   g.directional = false;
 
   let n = '';
@@ -92,7 +102,20 @@ test ('non directional', (t) => {
   });
 
   const f = g.add_node ('foo');
+
   g.add_edge (n, f);
 
   t.is (g.toString (), non_directional);
 });
+
+test ('attributes', (t) => {
+  const g = new Graph ('attr');
+
+  g.layout = GraphLayouts.neato;
+  g.overlap = false;
+  g.splines = true;
+  g.color = Color.black;
+  g.style = GraphStyles.bold;
+
+  t.is (g.toString (), attributes);
+});