more layout engines

test/Color.ts

@@ -4,6 +4,7 @@ import { Color } from '../lib';
 test ('serialize', (t) => {
   const wh = Color.white;
   const tr = Color.transparent;
+
   t.is (wh.toString (), '#ffffff');
   t.is (tr.toString (), '#00000000');
 });

test/Edge.ts

@@ -3,16 +3,20 @@ import { Edge, Color, EdgeStyles } from '../lib';
 
 test ('serialize', (t) => {
   const e = new Edge ('foo', 'bar', false);
+
   e.color = Color.white;
   e.style = EdgeStyles.dashed;
   const serialized = e.toString ();
+
   t.is (serialized, 'foo -- bar [style="dashed",color="#ffffff"]');
 });
 
 test ('serialize directional', (t) => {
   const e = new Edge ('foo', 'bar', true);
+
   e.color = Color.white;
   e.style = EdgeStyles.dashed;
   const serialized = e.toString ();
+
   t.is (serialized, 'foo -> bar [style="dashed",color="#ffffff"]');
 });

test/Node.ts

@@ -11,16 +11,19 @@ const serialized_table = `bar_foo [label=<<table>
 
 test ('serialize simple', (t) => {
   const g = new Node ('foo', 'bar', 'baz');
+
   g.color = Color.green;
   g.style = NodeStyles.dashed;
 
   const serialized = g.toString ();
+
   t.is (g.full_name, 'bar_foo');
   t.is (serialized, serialized_simple);
 });
 
 test ('serialize table', (t) => {
   const g = new Node ('foo', 'bar', 'baz');
+
   g.color = Color.green;
   g.style = NodeStyles.invisible;
 
@@ -44,6 +47,7 @@ test ('serialize table', (t) => {
   g.is_table = true;
 
   const serialized = g.toString ();
+
   t.is (g.full_name, 'bar_foo');
   t.is (serialized, serialized_table);
 });
@@ -51,6 +55,7 @@ test ('serialize table', (t) => {
 test ('adhere to naming convention', (t) => {
   t.throws (() => {
     const n = new Node ('invalid.name', 'parent');
+
     return n.toString ();
   }, { message: 'invalid name specified' });
 });