fixes

test/Graph.ts

@@ -1,16 +1,27 @@
 import test from 'ava';
-import { Graph, GraphStyles, Color } from '../lib';
+import { Graph, GraphStyles, Color, NodeStyles } from '../lib';
 
 const result = `digraph foo {
   subgraph cluster_foo_baz {
     color = #ff0000
     style = bold
 
-    foo_baz_asd [label=<asd>]
+    subgraph cluster_foo_baz_nested {
+      color = #808080
+      style = dotted
+
+      subgraph cluster_foo_baz_nested_unnamed {
+        color = #808080
+        style = dotted
+      }
+    }
+
+    foo_baz_asd [label="asd"]
+    foo_baz_test [style="bold", color="#808080"]
   }
 
-  foo_baz [label=<baz>]
-  foo_foo [label=<foo>]
+  foo_baz [label="baz"]
+  foo_foo [label="foo"]
 
   foo_foo -> foo_baz
 }`;
@@ -22,13 +33,31 @@ test ('serialize', (t) => {
   g.add_graph ((graph) => {
     graph.name = 'baz';
     graph.add_node ('asd');
+    graph.add_node ((n) => {
+      n.name = 'test';
+      n.style = NodeStyles.bold;
+      n.color = Color.gray;
+    });
+
+    // eslint-disable-next-line no-shadow
+    graph.add_graph ((g) => {
+      g.style = GraphStyles.dotted;
+      g.color = Color.gray;
+      g.name = 'nested';
+
+      // eslint-disable-next-line no-shadow, max-nested-callbacks
+      g.add_graph ((g) => {
+        g.style = GraphStyles.dotted;
+        g.color = Color.gray;
+      });
+    });
     graph.style = GraphStyles.bold;
     graph.color = Color.red;
   });
 
-  g.add_node ('baz');
-  g.add_node ('foo');
-  g.add_edge ('foo', 'baz');
+  const baz = g.add_node ('baz');
+  const foo = g.add_node ('foo');
+  g.add_edge (foo, baz);
 
   const serialized = g.toString ();
 

test/Node.ts

@@ -2,12 +2,12 @@ import test from 'ava';
 import { NodeStyles, Node, Color } from '../lib';
 
 const serialized_simple
-= 'bar_foo [label=<baz>,style="dashed",color="#00ff00"]';
+= 'bar_foo [label="baz", style="dashed", color="#00ff00"]';
 const serialized_table = `bar_foo [label=<<table>
   <tr><td>foo</td><td>bar</td><td>baz</td></tr>
   <tr><td>bar</td><td>baz</td><td>foo</td></tr>
   <tr><td>baz</td><td>foo</td><td>bar</td></tr>
-</table>>,style="invis",color="#00ff00"]`;
+</table>>, style="invis", color="#00ff00"]`;
 
 test ('serialize simple', (t) => {
   const g = new Node ('foo', 'bar', 'baz');
@@ -47,3 +47,10 @@ test ('serialize table', (t) => {
   t.is (g.full_name, 'bar_foo');
   t.is (serialized, serialized_table);
 });
+
+test ('adhere to naming convention', (t) => {
+  t.throws (() => {
+    const n = new Node ('invalid.name', 'parent');
+    return n.toString ();
+  }, { message: 'invalid name specified' });
+});