fix spacing

test/Graph.ts

@@ -1,23 +1,21 @@
 import test from 'ava';
 import { Graph, Node } from '../lib';
 
-const result = `subgraph cluster_bar_foo {
-  subgraph cluster_bar_foo_baz {
-
-    bar_foo_baz_asd
-
+const result = `digraph foo {
+  subgraph cluster_foo_baz {
+    foo_baz_asd
   }
 
-  bar_foo_baz
-  bar_foo_foo
+  foo_baz
+  foo_foo
 
-  bar_foo_foo -> bar_foo_baz
+  foo_foo -> foo_baz
 }`;
 
 test ('serialize', (t) => {
-  const g = new Graph ('foo', 'bar');
+  const g = new Graph ('foo');
 
-  t.is (g.full_name, 'bar_foo');
+  t.is (g.full_name, 'foo');
   g.add_graph (() => {
     const graph = new Graph ('baz');
     graph.add_node (() => new Node ('asd'));